Intangible Assets and Goodwill - Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	$ 19.2		$ 19.2		$ 140.5
Accumulated amortization	(8.5)		(8.5)		(82.6)
Intangible assets, net	10.7		10.7		57.9
Amortization expense	3.0	$ 3.2	9.4	$ 9.6
Intangible Assets, Amortization Expense, Remainder of 2015	0.2		0.2
Intangible Assets, Amortization Expense, 2016	0.9		0.9
Intangible Assets, Amortization Expense, 2017	0.9		0.9
Intangible Assets, Amortization Expense, 2018	0.9		0.9
Intangible Assets, Amortization Expense, 2019	0.9		0.9
Trade Names
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	14.9		14.9		34.2
Accumulated amortization	(4.2)		(4.2)		(14.0)
Intangible assets, net	10.7		10.7		20.2
Software
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	2.0		2.0		60.1
Accumulated amortization	(2.0)		(2.0)		(55.3)
Intangible assets, net	0.0		0.0		4.8
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	0.0		0.0		20.0
Accumulated amortization	0.0		0.0		(3.7)
Intangible assets, net	0.0		0.0		16.3
Other
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	2.3		2.3		26.2
Accumulated amortization	(2.3)		(2.3)		(9.6)
Intangible assets, net	$ 0.0		$ 0.0		$ 16.6