Debt Senior Notes (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended		12 Months Ended
	Dec. 31, 2016	Mar. 31, 2016	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Loss on early debt extinguishment	$ 29.5		$ (8.3)	$ (59.5)	$ 29.5		$ (29.5)	$ (67.8)	$ (1.6)
30-day grace period						30-day grace period
Interest Expense		$ 126.2			$ 150.4		$ 298.6	$ 465.4	$ 426.6
Term Loan Facility [Member]
Debt Instrument [Line Items]
Stated interest rate - percentage	4.50%				4.50%		4.50%
6.00% Senior Notes due November 2018 [Member]
Debt Instrument [Line Items]
Stated interest rate - percentage	6.00%				6.00%		6.00%
6.50% Senior Notes due September 2020 [Member]
Debt Instrument [Line Items]
Stated interest rate - percentage	6.50%				6.50%	6.50%	6.50%
Interest Expense							$ 21.1
6.25% Senior Notes due November 2021 [Member]
Debt Instrument [Line Items]
Stated interest rate - percentage	6.25%				6.25%	6.25%	6.25%