Pensions and Postretirement Benefits (Assets by fair value hierarchy) (Details) (USD $) | 12 Months Ended |
In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | $125.70 | $125.40 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 125.7 | 125.4 |
Level 1 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 115.9 | 115.6 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 115.9 | 115.6 |
Level 2 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 2.2 | 2.5 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 2.2 | 2.5 |
Level 3 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 7.6 | 7.3 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 7.6 | 7.3 |
Common Stock [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 47.8 | 50.8 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 47.8 | 50.8 |
Common Stock [Member] | Level 1 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 45.6 | 48.3 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 45.6 | 48.3 |
Common Stock [Member] | Level 2 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 2.2 | 2.5 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 2.2 | 2.5 |
Common Stock [Member] | Level 3 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 0 | 0 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 0 | 0 |
Equity Funds [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 26.9 | 26.9 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 26.9 | 26.9 |
Equity Funds [Member] | Level 1 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 26.9 | 26.9 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 26.9 | 26.9 |
Equity Funds [Member] | Level 2 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 0 | 0 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 0 | 0 |
Equity Funds [Member] | Level 3 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 0 | 0 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 0 | 0 |
Foreign Stock [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 5.4 | 5.6 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 5.4 | 5.6 |
Foreign Stock [Member] | Level 1 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 5.4 | 5.6 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 5.4 | 5.6 |
Foreign Stock [Member] | Level 2 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 0 | 0 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 0 | 0 |
Foreign Stock [Member] | Level 3 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 0 | 0 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 0 | 0 |
U.S. Government obligations [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 7 | 5.1 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 7 | 5.1 |
U.S. Government obligations [Member] | Level 1 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 7 | 5.1 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 7 | 5.1 |
U.S. Government obligations [Member] | Level 2 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 0 | 0 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 0 | 0 |
U.S. Government obligations [Member] | Level 3 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 0 | 0 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 0 | 0 |
Fixed Income Funds [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 19.6 | 18.8 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 19.6 | 18.8 |
Fixed Income Funds [Member] | Level 1 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 19.6 | 18.8 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 19.6 | 18.8 |
Fixed Income Funds [Member] | Level 2 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 0 | 0 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 0 | 0 |
Fixed Income Funds [Member] | Level 3 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 0 | 0 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 0 | 0 |
Balanced Funds [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 2.1 | 2.1 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 2.1 | 2.1 |
Balanced Funds [Member] | Level 1 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 2.1 | 2.1 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 2.1 | 2.1 |
Balanced Funds [Member] | Level 2 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 0 | 0 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 0 | 0 |
Balanced Funds [Member] | Level 3 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 0 | 0 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 0 | 0 |
Corporate Bonds [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 7.5 | 6.8 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 7.5 | 6.8 |
Corporate Bonds [Member] | Level 1 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 7.5 | 6.8 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 7.5 | 6.8 |
Corporate Bonds [Member] | Level 2 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 0 | 0 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 0 | 0 |
Corporate Bonds [Member] | Level 3 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 0 | 0 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 0 | 0 |
Cash and Cash Equivalents [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 1.8 | 2 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 1.8 | 2 |
Cash and Cash Equivalents [Member] | Level 1 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 1.8 | 2 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 1.8 | 2 |
Cash and Cash Equivalents [Member] | Level 2 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 0 | 0 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 0 | 0 |
Cash and Cash Equivalents [Member] | Level 3 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 0 | 0 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 0 | 0 |
Hedge Funds [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 7.6 | 7.3 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at beginning of year | 7.3 | 6.4 |
Net Unrealized Gain | 0.3 | 0.9 |
Purchases | 0 | 0 |
Fair value of plan assets at end of year | 7.6 | 7.3 |
Hedge Funds [Member] | Level 1 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 0 | 0 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 0 | 0 |
Hedge Funds [Member] | Level 2 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 0 | 0 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | 0 | 0 |
Hedge Funds [Member] | Level 3 [Member] | | |
Defined Benefit Plan Disclosure [Line Items] | | |
Fair value of plan assets | 7.6 | 7.3 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | | |
Fair value of plan assets at end of year | $7.60 | $7.30 |