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Debt and Financing (Details)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Mar. 31, 2018
Dec. 31, 2017
USD ($)
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 570.0    
Debt Instrument, Gross, Current Maturities (18.0)    
Premium/(Discount), Current Maturities 0.0    
Deferred Finance Costs, Current, Net 0.0    
Book Value, Current Maturities $ (18.0)    
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 $ 570.0   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 0.0    
Premium/(Discount), Debt 0.0    
Debt Issuance Cost 0.0    
Book Value 0.0    
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 0.0    
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 0.0    
Debt Issuance Cost (0.3)    
Book Value 47.9    
Debt Instrument, Gross, Current Maturities (1.5)    
Premium/(Discount), Current Maturities 0.0    
Deferred Finance Costs, Current, Net 0.0    
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 0.0    
Debt Issuance Cost (0.6)    
Book Value 248.5    
Debt Instrument, Gross, Current Maturities (9.0)    
Premium/(Discount), Current Maturities 0.0    
Deferred Finance Costs, Current, Net 0.0    
Book Value, Current Maturities $ (9.0)    
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 3.00    
Maximum Total Leverage Ratio, March 31, 2020 3.00    
Maximum Total Leverage Ratio, June 30, 2020 3.00    
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%