Intangible Assets and Goodwill - Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 139.9		$ 139.5
Accumulated amortization	(74.1)		(70.9)
Intangible assets, net	65.8		68.6
Amortization expense	3.2	3.6
Finite-Lived Intangible Assets, Amortization Expense, Remainder of 2014	9.4
Finite-Lived Intangible Assets, Amortization Expense, 2015	11.9
Finite-Lived Intangible Assets, Amortization Expense, 2016	8.5
Finite-Lived Intangible Assets, Amortization Expense, 2017	7.7
Finite-Lived Intangible Assets, Amortization Expense, 2018	6.3
Trade Names
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	34.3		34.3
Accumulated amortization	(10.3)		(9.2)
Intangible assets, net	24.0		25.1
Software
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	59.0		58.5
Accumulated amortization	(54.1)		(53.3)
Intangible assets, net	4.9		5.2
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	20.3		20.4
Accumulated amortization	(2.5)		(2.1)
Intangible assets, net	17.8		18.3
Other
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	26.3		26.3
Accumulated amortization	(7.2)		(6.3)
Intangible assets, net	19.1		20.0
Developed Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 15.6