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Debt - Schedule of the Company's Debt (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Mar. 13, 2012
Debt Instrument [Line Items]      
Borrowings under the Credit Agreement $ 185.0    
Other [1] 27.4 $ 18.7  
Unamortized debt issuance costs (23.3) (25.6)  
Total debt 3,619.4 3,422.9  
Less: current portion (675.6) (234.6)  
Long-term debt 2,943.8 3,188.3  
8.60% Senior Notes Due August 15, 2016      
Debt Instrument [Line Items]      
Senior notes 219.8 219.6  
6.125% Senior Notes Due January 15, 2017      
Debt Instrument [Line Items]      
Senior notes 251.3 251.2  
7.25% Senior Notes Due May 15, 2018      
Debt Instrument [Line Items]      
Senior notes 250.0 250.0  
11.25% Senior Notes Due February 1, 2019      
Debt Instrument [Line Items]      
Senior notes [2] 172.2 172.2  
8.25% Senior Notes Due March 15, 2019      
Debt Instrument [Line Items]      
Senior notes 238.9 238.9 $ 450.0
7.625% Senior Notes Due June 15, 2020      
Debt Instrument [Line Items]      
Senior notes 350.0 350.0  
7.875% Senior Notes Due March 15, 2021      
Debt Instrument [Line Items]      
Senior notes 448.7 448.5  
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 400.0 400.0  
6.50% Senior Notes Due November 15, 2023      
Debt Instrument [Line Items]      
Senior notes 350.0 350.0  
6.00% Senior Notes Due due April 1, 2024      
Debt Instrument [Line Items]      
Senior notes 400.0 400.0  
6.625% Debentures Due April 15, 2029      
Debt Instrument [Line Items]      
Debentures 199.5 199.5  
8.820% Debentures Due April 15, 2031      
Debt Instrument [Line Items]      
Debentures $ 69.0 $ 69.0  
[1] Includes fair value adjustments to the 8.25% senior notes due March 15, 2019 related to the Company’s fair value hedges, miscellaneous debt obligations and capital leases.
[2] As of June 30, 2016 and December 31, 2015, the interest rate on the 11.25% senior notes due February 1, 2019 was 13.0% and 12.75%, respectively, as a result of downgrades in the ratings of the notes by the rating agencies.