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Commitments and Contingencies (Details) $ in Millions	Dec. 31, 2016 USD ($)
Minimum rental commitments under non-cancelable leases
Minimum lease payments, 2017	$ 75.3
Minimum lease payments, 2018	69.8
Minimum lease payments, 2019	69.1
Minimum lease payments, 2020	65.7
Minimum lease payments, 2021	64.6
Minimum lease payments, Thereafter	331.9
Minimum lease payments, Total	676.4
Less: income from subleases, 2017	(8.9)	[1]
Less: income from subleases, 2018	(15.2)	[1]
Less: income from subleases, 2019	(15.5)	[1]
Less: income from subleases, 2020	(15.7)	[1]
Less: income from subleases, 2021	(16.2)	[1]
Less: income from subleases, Thereafter	(55.4)	[1]
Less: income from subleases, Total	(126.9)	[1]
Net minimum lease payments, 2017	66.4
Net minimum lease payments, 2018	54.6
Net minimum lease payments, 2019	53.6
Net minimum lease payments, 2020	50.0
Net minimum lease payments, 2021	48.4
Net minimum lease payments, Thereafter	276.5
Net minimum lease payments, Total	$ 549.5
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