Intangible Assets and Goodwill - Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 138.4	$ 144.1
Accumulated amortization	(62.6)	(62.2)
Intangible assets, net	75.8	81.9
Trade Names
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	34.2	37.7
Accumulated amortization	(5.5)	(6.0)
Intangible assets, net	28.7	31.7
Software
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	57.6	58.4
Accumulated amortization	(52.0)	(52.0)
Intangible assets, net	5.6	6.4
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	20.3	21.2
Accumulated amortization	(1.0)	(1.0)
Intangible assets, net	19.3	20.2
Other
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	26.3	26.8
Accumulated amortization	(4.1)	(3.2)
Intangible assets, net	$ 22.2	$ 23.6