Other Income (Expense), Net (Details) (USD $) In Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Other income (expense)
Interest income	$ 0		$ 0.2		$ 0.2		$ 0.2
Unrealized gains (losses) on financial derivatives	4.1	[1]	(3.9)	[1]	2.2	[1]	(3.0)	[1]
All other, net	(0.2)		0.1		(0.2)		0.1
Other non-operating income (expense), net	$ 3.9		$ (3.6)		$ 2.2		$ (2.7)

[1] See “Derivative Financial Instruments” in Note 1 for a discussion of accounting policy for such instruments.