Software (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Capitalized Computer Software, Net [Abstract]
Software	$ 857.3		$ 857.3		$ 812.1
Accumulated amortization	(330.3)		(330.3)		(219.4)
Software, net	527.0		527.0		$ 592.7
Amortization expense	$ 32.2	$ 23.8	$ 112.0	$ 74.7