Condensed Consolidated Statements of Comprehensive Income (Loss) (unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Tax effect on change in fair value of investment hedges	$ 25.2	$ (0.9)	$ (42.9)	$ (0.7)
Tax effect on change in fair value of interest rate caps/swaps	1.9	20.7	21.3	42.4
Tax effect on amounts reclassified to earnings of cash flow hedges	(6.7)	(0.8)	(7.3)	(1.6)
Tax effect on pension and post-retirement benefit plans	0.0	0.0	0.1	0.0
Tax effect on amortization prior service costs	0.3	0.4	0.6	0.6
Tax effect on amortization of actuarial losses	$ (0.3)	$ 0.0	$ (0.6)	$ 0.0