Other Financial Information, Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other Financial Information [Abstract]
Interest income	$ 8.5	$ 6.7	$ 16.4	$ 10.5
Interest expense	(25.0)	(21.8)	(47.5)	(40.3)
Gain (loss) on investments	3.6	0.2	(1.8)	0.8
Other	1.3	(2.2)	(0.9)	(3.9)
Other expense, net	$ (11.6)	$ (17.1)	$ (33.8)	$ (32.9)