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Indebtedness - Senior Notes - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended
May. 31, 2015
Dec. 31, 2015
Jul. 31, 2015
Dec. 31, 2014
4.875% Senior Notes Due 2025        
Debt Instrument [Line Items]        
Aggregate principal amount $ 750.0      
4.875% Senior Notes Due 2025 | Senior Notes        
Debt Instrument [Line Items]        
Interest rate on notes 4.875% 4.875%   4.875%
Net proceeds after underwriting discounts and commissions $ 737.4      
Underwriting discounts and commissions $ 12.6      
Debt instrument redemption, percentage of principal amount 100.00%      
6.75% Senior Subordinated Notes Due 2020 | Senior Subordinated Notes        
Debt Instrument [Line Items]        
Interest rate on notes 6.75% 6.75% 6.75% 6.75%