Debt and Financing (Details) $ in Millions | 6 Months Ended | 12 Months Ended | |
Jun. 30, 2018USD ($) | Mar. 31, 2018 | Dec. 31, 2017USD ($) |
Debt Instrument [Line Items] | | | |
Long-term Debt, Gross | $ 910.7 | | |
Premium/(Discount), Debt | (9.1) | | |
Debt Issuance Cost | (8.4) | | |
Book Value | 893.2 | | |
Book Value, Current Maturities | (28.5) | | $ (30.6) |
Par Value, Excluding Current Maturities | 882.2 | | |
Premium (Discount) | (9.1) | | |
Book Value, Excluding Current Maturities | 864.7 | | 875.5 |
Carrying Amount [Member] | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, fair value | 893.2 | | 906.1 |
Fair Value [Member] | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, fair value | 920.2 | | 929.9 |
Term Loan | | | |
Debt Instrument [Line Items] | | | |
Long-term Debt, Gross | 586.5 | | |
Premium/(Discount), Debt | (9.1) | | |
Debt Issuance Cost | (7.4) | | |
Book Value | 570 | | |
Debt Instrument, Gross, Current Maturities | (18) | | |
Premium/(Discount), Current Maturities | 0 | | |
Deferred Finance Costs, Current, Net | 0 | | |
Book Value, Current Maturities | $ (18) | | |
Stated Interest Rate | 10.59% | | |
Average Effective Interest Rate | 11.00% | | |
Term Loan | Carrying Amount [Member] | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, fair value | $ 570 | | 576.8 |
Term Loan | Fair Value [Member] | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, fair value | 595.8 | | 596.9 |
Line of Credit [Member] | 2014 ABL Facility Credit Agreement [Member] | | | |
Debt Instrument [Line Items] | | | |
Long-term Debt, Gross | 0 | | |
Premium/(Discount), Debt | 0 | | |
Debt Issuance Cost | 0 | | |
Book Value | 0 | | |
Line of credit facility, total cash and availability | 74.7 | | |
Secured Second A&R CDA [Member] | | | |
Debt Instrument [Line Items] | | | |
Long-term Debt, Gross | 26.9 | | |
Premium/(Discount), Debt | 0 | | |
Debt Issuance Cost | (0.1) | | |
Book Value | $ 26.8 | | |
Average Effective Interest Rate | 7.90% | | |
Unsecured Second A&R CD [Member] | | | |
Debt Instrument [Line Items] | | | |
Long-term Debt, Gross | $ 48.2 | | |
Premium/(Discount), Debt | 0 | | |
Debt Issuance Cost | (0.3) | | |
Book Value | 47.9 | | |
Debt Instrument, Gross, Current Maturities | (1.5) | | |
Premium/(Discount), Current Maturities | 0 | | |
Deferred Finance Costs, Current, Net | 0 | | |
Book Value, Current Maturities | $ (1.5) | | |
Average Effective Interest Rate | 7.90% | | |
Lease Financing Obligations [Member] | | | |
Debt Instrument [Line Items] | | | |
Long-term Debt, Gross | $ 249.1 | | |
Premium/(Discount), Debt | 0 | | |
Debt Issuance Cost | (0.6) | | |
Book Value | 248.5 | | |
Debt Instrument, Gross, Current Maturities | (9) | | |
Premium/(Discount), Current Maturities | 0 | | |
Deferred Finance Costs, Current, Net | 0 | | |
Book Value, Current Maturities | $ (9) | | |
Average Effective Interest Rate | 12.00% | | |
Lease Financing Obligations [Member] | Carrying Amount [Member] | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, fair value | $ 248.5 | | 254.6 |
Lease Financing Obligations [Member] | Fair Value [Member] | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, fair value | 248.1 | | 257.7 |
Letter of Credit [Member] | 2014 ABL Facility Credit Agreement [Member] | | | |
Debt Instrument [Line Items] | | | |
Letters of credit outstanding, amount | 351.5 | | |
Other Debt Obligations [Member] | Carrying Amount [Member] | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, fair value | 74.7 | | 74.7 |
Other Debt Obligations [Member] | Fair Value [Member] | | | |
Debt Instrument [Line Items] | | | |
Long-term debt, fair value | 76.3 | | $ 75.3 |
2014 ABL Facility Credit Agreement [Member] | | | |
Debt Instrument [Line Items] | | | |
Maximum borrowing capacity (Managed Accessibility) | 32.1 | | |
2014 ABL Facility Credit Agreement [Member] | Line of Credit [Member] | | | |
Debt Instrument [Line Items] | | | |
Line of credit facility, total cash and availability | $ 190.8 | | |
Term Loan Agreement | | | |
Debt Instrument [Line Items] | | | |
Maximum Total Leverage Ratio, June 30, 2018 | 3.5 | | |
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 | | 3.18 | |
London Interbank Offered Rate (LIBOR) | Term Loan | | | |
Debt Instrument [Line Items] | | | |
Floor interest rate | 1.00% | | |
Basis spread on variable rate | 8.50% | | |
Minimum [Member] | Secured Second A&R CDA [Member] | | | |
Debt Instrument [Line Items] | | | |
Stated Interest Rate | 7.00% | | |
Minimum [Member] | Unsecured Second A&R CD [Member] | | | |
Debt Instrument [Line Items] | | | |
Stated Interest Rate | 7.00% | | |
Minimum [Member] | Lease Financing Obligations [Member] | | | |
Debt Instrument [Line Items] | | | |
Stated Interest Rate | 8.70% | | |
Maximum [Member] | Secured Second A&R CDA [Member] | | | |
Debt Instrument [Line Items] | | | |
Stated Interest Rate | 18.30% | | |
Maximum [Member] | Unsecured Second A&R CD [Member] | | | |
Debt Instrument [Line Items] | | | |
Stated Interest Rate | 18.30% | | |
Maximum [Member] | Lease Financing Obligations [Member] | | | |
Debt Instrument [Line Items] | | | |
Stated Interest Rate | 18.20% | | |