Other Income (Expense), Net (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Other Income and Expenses [Abstract]
Interest income	$ 0.4		$ 0.2		$ 0.3
Unrealized gains (losses) on financial derivatives	0.8	[1]	4.0	[1]	(4.9)	[1]
Realized gains on investments	0.5		0.1		0.8
Insurance settlement	0.4		0		0
All other, net	0.7		0		(0.4)
Other non-operating income (expense), net	$ 2.8		$ 4.3		$ (4.2)

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