Other, Net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Component of Other Income, Nonoperating [Line Items]
Interest income	$ 4.0	$ 8.0	$ 12.6	$ 19.8
Exchange gain (loss)	(1.3)	11.2	(4.1)	3.6
Earnings (loss) from equity investments	1.7	0	(4.3)	0
Other	13.0	2.1	17.0	5.2
Other, net	$ 17.4	$ 21.3	$ 21.2	$ 28.6