Commitments and Contingencies - Future Minimum Payments of Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Future minimum payments under operating leases
2016	$ 18.4
2017	16.3
2018	14.7
2019	13.3
2020	7.6
2021 and beyond	20.5
Future minimum rentals to be received under operating subleases
2016	0.1
2017	0.2
2018	0.2
2019	0.1
Rent expense	15.2	$ 17.4	$ 15.2
Future minimum payments under capital leases net of leasehold improvement allowances
2016	0.3
2017	4.9
2018	3.5
2019	2.9
2020	3.5
2021 and beyond	14.9
Capital lease obligations imputed interest	$ 5.6