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Long-Term Debt (Narrative) (Amendment of the New Credit Agreement) (Details) - USD ($)		12 Months Ended
	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Apr. 15, 2016
Debt Instrument [Line Items]
Long-term Debt		$ 3,806,800,000
Proceeds from debt issuance		$ 2,586,900,000	$ 816,500,000	$ 346,400,000
Adjustable Rate Loans [Member] | Federal Funds Effective Swap Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)		0.50%
Adjustable Rate Loans [Member] | Adjusted LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)		1.00%
Term Loan B Facility due 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 2,400,000,000
Excess cash flows, period from submission of compliance certificate for which payment is required (in days)		10 days
Excess cash flows		$ 37,200,000
Term Loan B Facility due 2023 [Member] | Eurocurrency Loans [Member]
Debt Instrument [Line Items]
Proceeds from debt issuance		$ 200,000,000
Quarterly principal payments, percentage of principal amount		0.25%
Term Loan B Facility due 2023 [Member] | Eurocurrency Loans [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)		3.25%
Term Loan B Facility due 2023 [Member] | Adjustable Rate Loans [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)		2.25%
Revolving Credit Facility [Member] | Line of Credit [Member] | Minimum [Member]
Debt Instrument [Line Items]
Commitment fee percentage		0.25%
Revolving Credit Facility [Member] | Line of Credit [Member] | Maximum [Member]
Debt Instrument [Line Items]
Commitment fee percentage		0.35%
Revolving Credit Facility [Member] | Line of Credit [Member] | Eurocurrency Loans [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 0
Revolving Credit Facility [Member] | Line of Credit [Member] | Eurocurrency Loans [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	2.75%	2.75%
Revolving Credit Facility [Member] | Line of Credit [Member] | Adjustable Rate Loans [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.75%	1.75%
Deutsche Bank AG, New York Branch [Member] | Term Loan B Facility due 2023 [Member]
Debt Instrument [Line Items]
Principal amount of debt		$ 2,400,000,000.0			$ 2,200,000,000.0
Original issuance discount					$ 33,000,000
Deutsche Bank AG, New York Branch [Member] | Term Loan B Facility due 2023 [Member] | Eurocurrency Loans [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	3.25%
Deutsche Bank AG, New York Branch [Member] | Term Loan B Facility due 2023 [Member] | Adjustable Rate Loans [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	2.25%

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