Other Income (Expense), 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
Other Income (Expense), Net
Interest income	$ 0.1		$ 0		$ 0.3		$ 0.2
Unrealized (losses) gains on financial derivatives	12.2		(12.7)		16.4		(19.8)
All other, net	0.4		(0.2)		0.8		(0.2)
Other non-operating income (expense), net	0.4		3.9		2.2		2.2
Financial derivatives
Other Income (Expense), Net
Unrealized (losses) gains on financial derivatives	$ (0.1)	[1]	$ 4.1	[1]	$ 1.1	[1]	$ 2.2	[1]

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