Goodwill and Other Intangible Assets - Other Intagible Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Intangible Assets [Line Items]
Gross Carrying Amount	$ 89.0	$ 94.8
Accumulated Amortization	(49.2)	(48.5)
Net Carrying Amount	39.8	46.3
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2015	4.7
2016	4.2
2017	3.6
2018	3.2
2019	2.8
Indefinite Lived Trade Names [Member]
Intangible Assets [Line Items]
Gross Carrying Amount	10.4	11.8
Accumulated Amortization	0	0
Net Carrying Amount	10.4	11.8
Customer Relationships [Member]
Intangible Assets [Line Items]
Gross Carrying Amount	64.7	69.1
Accumulated Amortization	(43.4)	(43.5)
Net Carrying Amount	21.3	25.6
Finite-lived trade names [Member]
Intangible Assets [Line Items]
Gross Carrying Amount	1.6	1.7
Accumulated Amortization	(1.3)	(1.3)
Net Carrying Amount	0.3	0.4
Amortization of intangible assets	5.5
Other contract-related assets [Member]
Intangible Assets [Line Items]
Gross Carrying Amount	8.3	9.3
Accumulated Amortization	(1.5)	(0.8)
Net Carrying Amount	6.8	8.5
Other
Intangible Assets [Line Items]
Gross Carrying Amount	4.0	2.9
Accumulated Amortization	(3.0)	(2.9)
Net Carrying Amount	$ 1.0	$ 0