Long-Term and Other Debt Schedule of Long-term Debt Instruments (Details) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Debt Instrument
Total long-term debt outstanding		$ 8,410.2	$ 8,516.0
Less: debt payments due within one year		(50.4)	(50.6)
Long-term debt, net of debt payments due within one year		8,359.8	8,465.4
Revolver, varying interest rate, due 2018
Debt Instrument
Total long-term debt outstanding		115.0	185.0
Senior secured term loan credit facility, due 2020
Debt Instrument
Total long-term debt outstanding	[1]	2,251.5	2,267.6
Long-term debt, gross		2,259.7	2,277.0
Loan discount amortization		8.2	9.4
Senior secured term loan credit facility due 2021
Debt Instrument
Total long-term debt outstanding	[2]	1,967.6	1,980.3
Long-term debt, gross		1,985.0	2,000.0
Loan discount amortization		17.4	19.7
2018 Notes
Debt Instrument
Total long-term debt outstanding		250.0	250.0
2020 Notes
Debt Instrument
Total long-term debt outstanding		300.0	300.0
2021 Notes
Debt Instrument
Total long-term debt outstanding	[3]	348.1	347.8
Long-term debt, gross		350.0	350.0
Loan discount amortization		1.9	2.2
Secured Notes
Debt Instrument
Total long-term debt outstanding		950.0	950.0
Unsecured Notes
Debt Instrument
Total long-term debt outstanding		2,200.0	2,200.0
Capital lease obligations, 3.9% interest as of September 30, 2015 payable monthly through 2019
Debt Instrument
Total long-term debt outstanding		$ 28.0	$ 35.3
Capital lease interest rate		3.90%	3.90%

[1] Total of $2,259.7 million in principal amount less unamortized loan discount in the amount of $8.2 million as of September 30, 2015. Total of $2,277.0 million in principal amount less unamortized loan discount in the amount of $9.4 million as of December 31, 2014.

[2] Total of $1,985.0 million in principal amount less unamortized loan discount in the amount of $17.4 million as of September 30, 2015. Total of $2,000.0 million in principal amount less unamortized loan discount in the amount of $19.7 million as of December 31, 2014.

[3] Total of $350.0 million in principal amount less unamortized loan discount in the amount of $1.9 million as of September 30, 2015. Total of $350.0 million in principal amount less unamortized loan discount in the amount of $2.2 million as of December 31, 2014.