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Debt - Schedule of the Company's Debt (Detail) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Mar. 13, 2012
Debt Instrument [Line Items]        
Borrowings under the Credit Agreement $ 145.0      
Other [1] 26.7 $ 18.7    
Unamortized debt issuance costs (24.5) (25.6)    
Total debt 3,577.3 3,422.9    
Less: current portion (634.4) (234.6)    
Long-term debt 2,942.9 3,188.3    
8.60% Senior Notes Due August 15, 2016        
Debt Instrument [Line Items]        
Senior notes 219.7 219.6    
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 $ 239.0 $ 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 448.6 448.5    
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 March 31, 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.