Other, Net (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other, net (income) expense
Foreign currency exchange transactions	$ (2.3)	$ 3.1	$ 0
(Gain) loss on equity investments	(0.4)	(0.6)	1.7
Costs related to redemption of Senior Notes	0	0	5.9
Other	(1.6)	1.5	(0.8)
Other, net	(4.3)	4.0	6.8
Schedule of Equity Method Investments [Line Items]
Income (expense) from the recognition of certain equity repurchase agreements at fair value	0.3	(2.4)
Quixote Corporation
Schedule of Equity Method Investments [Line Items]
Loss of the write-down of the Company's pre-acquisition investment in acquiree			$ 1.8