Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Leases [Abstract]
Rent expense	$ 19.5	$ 19.3	$ 16.2
Future minimum rental commitments under non-cancelable operating leases [Abstract]
2019	17.3
2020	13.0
2021	9.5
2022	8.2
2023	7.0
Thereafter	24.8
Future minimum payments to be received under non-cancelable leases [Abstract]
2019	1.6
2020	1.2
2021	1.2
2022	1.1
2023	1.0
Thereafter	$ 0.0