Goodwill and Other Intangible Assets - Other Intagible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 73.8	$ 89.0
Accumulated Amortization	(45.3)	(49.2)
Net Carrying Amount	28.5	39.8
Amortization of intangible assets	4.2	5.5	$ 6.4
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2016	3.2
2017	2.8
2018	2.5
2019	2.2
2020	2.1
Indefinite-lived trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	9.0	10.4
Accumulated Amortization	0.0	0.0
Net Carrying Amount	9.0	10.4
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	54.4	64.7
Accumulated Amortization	(40.0)	(43.4)
Net Carrying Amount	14.4	21.3
Finite-lived trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1.1	1.6
Accumulated Amortization	(0.9)	(1.3)
Net Carrying Amount	0.2	0.3
Amortization of intangible assets	4.2
Other contract-related assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5.6	8.3
Accumulated Amortization	(1.5)	(1.5)
Net Carrying Amount	4.1	6.8
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3.7	4.0
Accumulated Amortization	(2.9)	(3.0)
Net Carrying Amount	$ 0.8	$ 1.0