Long-Term and Other Debt - Maturities of Debt (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument
Within 1 Year	$ 50.6
In 2 Years	50.9
In 3 Years	51.2
In 4 Years	486.5
In 5 Years	46.1
After 5 Years	7,862.0
Total long-term debt outstanding	8,547.3
Unamortized discount	(31.3)
Total long-term debt outstanding	8,516.0	3,192.6
Revolver | Revolver, varying interest rate, due 2018
Debt Instrument
Within 1 Year	0
In 2 Years	0
In 3 Years	0
In 4 Years	185.0
In 5 Years	0
After 5 Years	0
Total long-term debt outstanding	185.0
Total long-term debt outstanding	185.0	0
Term Loan | Term Loan, varying interest rate, due 2020
Debt Instrument
Within 1 Year	23.0
In 2 Years	23.0
In 3 Years	23.0
In 4 Years	23.0
In 5 Years	23.0
After 5 Years	2,162.0
Total long-term debt outstanding	2,277.0
Term Loan | Term Loan, varying interest rate, due 2022
Debt Instrument
Within 1 Year	20.0
In 2 Years	20.0
In 3 Years	20.0
In 4 Years	20.0
In 5 Years	20.0
After 5 Years	1,900.0
Total long-term debt outstanding	2,000.0
Senior subordinated notes | Senior subordinated notes, due in 2018
Debt Instrument
Within 1 Year	0
In 2 Years	0
In 3 Years	0
In 4 Years	250.0
In 5 Years	0
After 5 Years	0
Total long-term debt outstanding	250.0
Total long-term debt outstanding	250.0	250.0
Senior subordinated notes | Senior subordinated notes due 2020
Debt Instrument
Within 1 Year	0
In 2 Years	0
In 3 Years	0
In 4 Years	0
In 5 Years	0
After 5 Years	300.0
Total long-term debt outstanding	300.0
Total long-term debt outstanding	300.0	300.0
Senior subordinated notes | Senior subordinated notes due in 2021
Debt Instrument
Within 1 Year	0
In 2 Years	0
In 3 Years	0
In 4 Years	0
In 5 Years	0
After 5 Years	350.0
Total long-term debt outstanding	350.0
Unamortized discount	(2.2)
Total long-term debt outstanding	347.8	0
Senior subordinated notes | Senior subordinated secured notes, due in 2022
Debt Instrument
Within 1 Year	0
In 2 Years	0
In 3 Years	0
In 4 Years	0
In 5 Years	0
After 5 Years	950.0
Total long-term debt outstanding	950.0
Total long-term debt outstanding	950.0	0
Senior subordinated notes | Senior subordinated unsecured notes, due in 2022
Debt Instrument
Within 1 Year	0
In 2 Years	0
In 3 Years	0
In 4 Years	0
In 5 Years	0
After 5 Years	2,200.0
Total long-term debt outstanding	2,200.0
Total long-term debt outstanding	2,200.0	0
Capital lease obligations | Capital lease obligations
Debt Instrument
Within 1 Year	7.6
In 2 Years	7.9
In 3 Years	8.2
In 4 Years	8.5
In 5 Years	3.1
After 5 Years	0
Total long-term debt outstanding	35.3
Total long-term debt outstanding	$ 35.3	$ 0.1