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Debt - Schedule of Debt (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Other [1] $ 32.7 $ 38.9
Unamortized debt issuance costs (15.5) (16.3)
Total debt 2,171.8 2,091.5
Less: current portion (38.1) (216.2)
Long-term debt 2,133.7 1,875.3
11.25% Senior Notes Due February 1, 2019    
Debt Instrument [Line Items]    
Senior notes [2]   172.2
7.625% Senior Notes Due June 15, 2020    
Debt Instrument [Line Items]    
Senior notes 65.8 65.8
7.875% Senior Notes Due March 15, 2021    
Debt Instrument [Line Items]    
Senior notes 190.4 190.4
8.875% Debentures Due April 15, 2021    
Debt Instrument [Line Items]    
Debentures 81.0 81.0
7.00% Senior Notes Due February 15, 2022    
Debt Instrument [Line Items]    
Senior notes 140.0 140.0
6.50% Senior Notes Due November 15, 2023    
Debt Instrument [Line Items]    
Senior notes 290.6 290.6
6.00% Senior Notes Due April 1, 2024    
Debt Instrument [Line Items]    
Senior notes 298.3 298.3
6.625% Debentures Due April 15, 2029    
Debt Instrument [Line Items]    
Debentures 157.9 157.9
8.820% Debentures Due April 15, 2031    
Debt Instrument [Line Items]    
Debentures 69.0 69.0
ABL Credit Agreement    
Debt Instrument [Line Items]    
Credit Agreement 318.0 59.0
Term Loan Credit Agreement Due January 15, 2024    
Debt Instrument [Line Items]    
Credit Agreement [3] $ 543.6 $ 544.7
[1] Includes miscellaneous debt obligations.
[2] As of December 31, 2018 the interest rate on the 11.25% senior notes due February 1, 2019 had contractually increased to 13.25%.
[3] As of March 31, 2019 and December 31, 2018, the interest rate on the Term Loan Credit Agreement due January 15, 2024 was 7.50% and 7.51%, respectively.