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Commitments and Contingencies (Details) $ in Millions	Dec. 31, 2018 USD ($)
Minimum rental commitments under non-cancelable leases
Minimum lease payments, 2019	$ 87.0
Minimum lease payments, 2020	80.7
Minimum lease payments, 2021	75.9
Minimum lease payments, 2022	71.7
Minimum lease payments, 2023	71.0
Minimum lease payments, Thereafter	215.3
Minimum lease payments, Total	601.6
Less: income from subleases, 2019	(26.8)	[1]
Less: income from subleases, 2020	(25.6)	[1]
Less: income from subleases, 2021	(23.7)	[1]
Less: income from subleases, 2022	(24.0)	[1]
Less: income from subleases, 2023	(24.3)	[1]
Less: income from subleases, Thereafter	(58.4)	[1]
Less: income from subleases, Total	(182.8)	[1]
Net minimum lease payments, 2019	60.2
Net minimum lease payments, 2020	55.1
Net minimum lease payments, 2021	52.2
Net minimum lease payments, 2022	47.7
Net minimum lease payments, 2023	46.7
Net minimum lease payments, Thereafter	156.9
Net minimum lease payments, Total	$ 418.8
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