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Long-term Debt (Summary of Long-term Debt) (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]          
Foreign currency remeasurement loss on long-term debt $ 140,790,000 $ 0 $ 0    
Senior Notes [Member] | 4.875% Senior Notes [Member]          
Debt Instrument [Line Items]          
Interest rate       4.875% 4.875%
Face amount         $ 1,600,000,000
Long-term debt, fair value   0     $ 1,571,000,000
Senior Notes [Member] | 3.625% Senior Notes [Member]          
Debt Instrument [Line Items]          
Interest rate       3.625% 3.625%
Face amount       € 1,300,000,000 $ 1,561,300,000.0
Long-term debt, fair value   0     $ 1,575,000,000
Proceeds from convertible debt 1,420,500,000        
Foreign currency remeasurement loss on long-term debt $ 140,800,000        
Senior Notes [Member] | 4.375% Senior Notes [Member]          
Debt Instrument [Line Items]          
Interest rate       4.375% 4.375%
Face amount         $ 1,000,000,000
Long-term debt, fair value   975,000,000     $ 983,000,000
Senior Notes [Member] | 5.50% Senior Notes [Member]          
Debt Instrument [Line Items]          
Interest rate       5.50% 5.50%
Face amount         $ 700,000,000.0
Long-term debt, fair value   758,000,000     $ 739,000,000
Senior Notes [Member] | 5.875% Senior Notes [Member]          
Debt Instrument [Line Items]          
Interest rate       5.875% 5.875%
Face amount         $ 800,000,000
Long-term debt, fair value   868,000,000     $ 856,000,000
Senior Notes [Member] | 5.750% Senior Notes [Member]          
Debt Instrument [Line Items]          
Interest rate       5.75% 5.75%
Face amount         $ 400,000,000
Long-term debt, fair value   431,000,000     $ 427,000,000
Senior Notes [Member] | 5.375% Senior Notes [Member]          
Debt Instrument [Line Items]          
Interest rate       5.375% 5.375%
Face amount         $ 500,000,000
Long-term debt, fair value   $ 539,000,000     $ 530,000,000