Intangible Assets and Goodwill - Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 138.6	$ 144.1
Accumulated amortization	(65.6)	(62.2)
Intangible assets, net	73.0	81.9
Finite-Lived Intangible Assets, Amortization Expense, Remainder of 2013	7.2
Finite-Lived Intangible Assets, Amortization Expense, 2014	12.7
Finite-Lived Intangible Assets, Amortization Expense, 2015	11.2
Finite-Lived Intangible Assets, Amortization Expense, 2016	9.2
Finite-Lived Intangible Assets, Amortization Expense, 2017	8.2
Finite-Lived Intangible Assets, Amortization Expense, 2018	6.5
Trade Names
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	34.2	37.7
Accumulated amortization	(6.9)	(6.0)
Intangible assets, net	27.3	31.7
Software
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	57.8	58.4
Accumulated amortization	(52.3)	(52.0)
Intangible assets, net	5.5	6.4
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	20.2	21.2
Accumulated amortization	(1.4)	(1.0)
Intangible assets, net	18.8	20.2
Other
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	26.4	26.8
Accumulated amortization	(5.0)	(3.2)
Intangible assets, net	$ 21.4	$ 23.6