Other Financial Information, Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Other Financial Information [Abstract]
Interest income	$ 7.9	$ 3.8
Interest expense	(22.5)	(18.5)
(Loss) gain on investments	(5.4)	0.6
Other	(2.2)	(1.7)
Other expense, net	$ (22.2)	$ (15.8)