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Debt - Schedule of the Company's Debt (Detail) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Borrowings under the Credit Agreement $ 350.0 $ 185.0
Other [1] 19.1 8.5
Unamortized debt issuance costs (12.9) (16.5)
Total debt 2,252.5 2,387.4
Less: current portion (19.1) (8.2)
Long-term debt 2,233.4 2,379.2
11.25% Senior Notes Due February 1, 2019    
Debt Instrument [Line Items]    
Senior notes [2] 172.2 172.2
7.625% Senior Notes Due June 15, 2020    
Debt Instrument [Line Items]    
Senior notes 238.4 350.0
7.875% Senior Notes Due March 15, 2021    
Debt Instrument [Line Items]    
Senior notes 449.0 448.8
8.875% Debentures Due April 15, 2021    
Debt Instrument [Line Items]    
Debentures 80.9 80.9
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 290.6 350.0
6.00% Senior Notes Due April 1, 2024    
Debt Instrument [Line Items]    
Senior notes 298.3 400.0
6.625% Debentures Due April 15, 2029    
Debt Instrument [Line Items]    
Debentures 157.9 199.5
8.820% Debentures Due April 15, 2031    
Debt Instrument [Line Items]    
Debentures $ 69.0 $ 69.0
[1] Includes miscellaneous debt obligations and capital leases.
[2] As of June 30, 2017 and December 31, 2016, the interest rate on the 11.25% senior notes due February 1, 2019 was 13.25%, the maximum rate on these notes, as a result of ratings downgrades.