Debt and Financing (Details) $ in Millions | 9 Months Ended | 12 Months Ended | |
Sep. 30, 2018USD ($) | Mar. 31, 2018 | Dec. 31, 2017USD ($) |
Debt Instrument [Line Items] | | | |
Par Value | $ 904.4 | | |
Discount | (8.5) | | |
Debt Issuance Costs | (7.8) | | |
Book Value | 888.1 | | |
Book Value, Current Maturities | (25.1) | | $ (30.6) |
Par Value, Excluding Current Maturities | 879.3 | | |
Premium (Discount) | (8.5) | | |
Book Value, Excluding Current Maturities | 863 | | 875.5 |
Book Value | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, fair value | 888.1 | | 906.1 |
Fair value | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, fair value | 921.6 | | 929.9 |
Term Loan | | | |
Debt Instrument [Line Items] | | | |
Par Value | 582 | | |
Discount | (8.5) | | |
Debt Issuance Costs | (6.9) | | |
Book Value | 566.6 | | |
Par Value, Current Maturities | (18) | | |
Discount, Current Maturities | 0 | | |
Deferred Issuance Costs, Current | 0 | | |
Book Value, Current Maturities | $ (18) | | |
Average Effective Interest Rate | 11.10% | | |
Term Loan | Book Value | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, fair value | $ 566.6 | | 576.8 |
Term Loan | Fair value | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, fair value | 595.4 | | 596.9 |
ABL Facility | 2014 ABL Facility Credit Agreement | | | |
Debt Instrument [Line Items] | | | |
Par Value | 0 | | |
Discount | 0 | | |
Debt Issuance Costs | 0 | | |
Book Value | 0 | | |
Line of credit facility, total cash and availability | 73.9 | | |
Secured Second A&R CDA | | | |
Debt Instrument [Line Items] | | | |
Par Value | 26.9 | | |
Discount | 0 | | |
Debt Issuance Costs | (0.1) | | |
Book Value | $ 26.8 | | |
Average Effective Interest Rate | 7.90% | | |
Unsecured Second A&R CDA | | | |
Debt Instrument [Line Items] | | | |
Par Value | $ 48.2 | | |
Discount | 0 | | |
Debt Issuance Costs | (0.2) | | |
Book Value | 48 | | |
Par Value, Current Maturities | (1.5) | | |
Discount, Current Maturities | 0 | | |
Deferred Issuance Costs, Current | 0 | | |
Book Value, Current Maturities | $ (1.5) | | |
Average Effective Interest Rate | 7.90% | | |
Lease financing obligations | | | |
Debt Instrument [Line Items] | | | |
Par Value | $ 247.3 | | |
Discount | 0 | | |
Debt Issuance Costs | (0.6) | | |
Book Value | 246.7 | | |
Par Value, Current Maturities | (5.6) | | |
Discount, Current Maturities | 0 | | |
Deferred Issuance Costs, Current | 0 | | |
Book Value, Current Maturities | $ (5.6) | | |
Average Effective Interest Rate | 14.50% | | |
Lease financing obligations | Book Value | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, fair value | $ 246.7 | | 254.6 |
Lease financing obligations | Fair value | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, fair value | 249.4 | | 257.7 |
Letter of Credit [Member] | 2014 ABL Facility Credit Agreement | | | |
Debt Instrument [Line Items] | | | |
Letters of credit outstanding, amount | 345 | | |
Other Debt Obligations | Book Value | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, fair value | 74.8 | | 74.7 |
Other Debt Obligations | Fair value | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, fair value | 76.8 | | $ 75.3 |
2014 ABL Facility Credit Agreement | | | |
Debt Instrument [Line Items] | | | |
Maximum borrowing capacity (Managed Accessibility) | 32 | | |
2014 ABL Facility Credit Agreement | ABL Facility | | | |
Debt Instrument [Line Items] | | | |
Line of credit facility, total cash and availability | $ 225.2 | | |
Term Loan Agreement | | | |
Debt Instrument [Line Items] | | | |
Maximum Total Leverage Ratio, September 30, 2018 | 3.5 | | |
Maximum Total Leverage Ratio, December 31, 2018 | 3.50 | | |
Maximum Total Leverage Ratio, March 31, 2019 | 3.25 | | |
Maximum Total Leverage Ratio, June 30, 2019 | 3.25 | | |
Maximum Total Leverage Ratio, September 30, 2019 | 3.25 | | |
Maximum Total Leverage Ratio, December 31, 2019 | 3 | | |
Maximum Total Leverage Ratio, March 31, 2020 | 3 | | |
Maximum Total Leverage Ratio, June 30, 2020 | 3 | | |
Maximum Total Leverage Ratio, September 30, 2020 | 2.75 | | |
Maximum Total Leverage Ratio, December 31, 2020 | 2.75 | | |
Maximum Total Leverage Ratio, March 31, 2021 | 2.75 | | |
Maximum Total Leverage Ratio, June 30, 2021 and thereafter | 2.50 | | |
Total leverage ratio | | 3.13 | |
London Interbank Offered Rate (LIBOR) | Term Loan | | | |
Debt Instrument [Line Items] | | | |
Floor interest rate | 1.00% | | |
Basis spread on variable rate | 8.50% | | |