Intangible Assets and Goodwill - Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	$ 140.5		$ 140.5		$ 140.5
Accumulated amortization	(88.9)		(88.9)		(82.6)
Intangible assets, net	51.6		51.6		57.9
Amortization expense	3.1	$ 3.2	6.4	$ 6.4
Intangible Assets, Amortization Expense, Remainder of 2015	5.7		5.7
Intangible Assets, Amortization Expense, 2016	9.9		9.9
Intangible Assets, Amortization Expense, 2017	8.7		8.7
Intangible Assets, Amortization Expense, 2018	6.6		6.6
Intangible Assets, Amortization Expense, 2019	6.2		6.2
Trade Names
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	34.2		34.2		34.2
Accumulated amortization	(16.4)		(16.4)		(14.0)
Intangible assets, net	17.8		17.8		20.2
Software
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	60.0		60.0		60.1
Accumulated amortization	(56.5)		(56.5)		(55.3)
Intangible assets, net	3.5		3.5		4.8
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	20.0		20.0		20.0
Accumulated amortization	(4.6)		(4.6)		(3.7)
Intangible assets, net	15.4		15.4		16.3
Other
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	26.3		26.3		26.2
Accumulated amortization	(11.4)		(11.4)		(9.6)
Intangible assets, net	14.9		14.9		$ 16.6
Developed Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 11.6		$ 11.6