Long-Term Debt -Senior Notes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Debt, short-term and long-term	$ 3,303.1		$ 3,267.8
Net loss on extinguishments of long-term debt	(57.4)	$ 0.0
Deferred financing costs, net	22.6		33.4
Deferred Finance Costs, Net	22.6		33.4
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	3,280.5		3,234.4
Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term			$ 600.0
Net loss on extinguishments of long-term debt	43.0
Redemption Premium	37.0
Deferred Finance Costs, Net	5.4
Long-term Debt, Weighted Average Interest Rate			6.00%
Deferred Finance Costs, Net			$ 5.6
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium			594.4
Senior Notes due 2024 [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term	$ 575.0		$ 575.0
Long-term Debt, Weighted Average Interest Rate	5.50%		5.50%
Deferred Finance Costs, Net	$ 5.8		$ 6.0
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	569.2		569.0
Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term	$ 525.0		$ 525.0
Long-term Debt, Weighted Average Interest Rate	5.00%		5.00%
Deferred Finance Costs, Net	$ 5.1		$ 5.3
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	519.9		519.7
Term Loan [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term	1,479.2		$ 1,483.0
Deferred Finance Costs, Net	$ 5.0
Long-term Debt, Weighted Average Interest Rate	3.15%		3.30%
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	$ 1,476.9		$ 1,468.1
Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term	$ 600.0
Long-term Debt, Weighted Average Interest Rate	5.00%
Deferred Finance Costs, Net	$ 8.0
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	$ 592.0
Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage	106.182%