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Debt - Schedule of Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Unamortized debt issuance costs $ (9.6) $ (12.8)
Total debt 1,503.1 1,818.4
Less: current portion 61.1 71.2
Long-term debt 1,442.0 1,747.2
7.625% Notes Due June 15, 2020    
Debt Instrument [Line Items]    
Notes   65.8
7.875% Notes Due March 15, 2021    
Debt Instrument [Line Items]    
Notes   167.1
7.000% Notes Due February 15, 2022    
Debt Instrument [Line Items]    
Notes 79.3 140.0
6.500% Notes Due November 15, 2023    
Debt Instrument [Line Items]    
Notes 75.0 290.6
6.000% Notes Due April 1, 2024    
Debt Instrument [Line Items]    
Notes 61.7 298.3
8.875% Debentures Due April 15, 2021    
Debt Instrument [Line Items]    
Debentures 55.6 60.2
8.250% Notes Due July 1, 2027    
Debt Instrument [Line Items]    
Notes 245.8  
8.500% Notes Due April 15, 2029    
Debt Instrument [Line Items]    
Notes 301.6  
6.625% Debentures Due April 15, 2029    
Debt Instrument [Line Items]    
Debentures 103.4 157.9
8.820% Debentures Due April 15, 2031    
Debt Instrument [Line Items]    
Debentures 54.5 69.0
ABL Credit Facility    
Debt Instrument [Line Items]    
Credit Facility/Term Loan 56.1 42.0
Term Loan Due January 15, 2024    
Debt Instrument [Line Items]    
Credit Facility/Term Loan [1] $ 535.8 $ 540.3
[1] As of December 31, 2020 and 2019, the interest rate on the Term Loan due January 15, 2024 was 5.15% and 6.80%, respectively.