Commitments and Contingencies (Schedule of Future Minimum Lease Payments under Noncancelable Operatng Leases) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Leases
2019	$ 22.3
2020	18.1
2021	14.4
2022	9.7
2023	6.0
Thereafter	10.7
Total minimum lease payments	81.2
Minimum Lease Payments
2019	3.0
2020	3.3
2021	3.2
2022	1.9
2023	0.0
Thereafter	0.0
Total minimum lease payments	11.4
Capital Leases, Interest
2019	0.6
2020	0.4
2021	0.2
2022	0.1
2023	0.0
Thereafter	0.0
Total minimum lease payments	1.3
Capital Leases, Net Present Value
2019	2.4
2020	2.9
2021	3.0
2022	1.8
2023	0.0
Thereafter	0.0
Total minimum lease payments	10.1
Total
2019	24.7
2020	21.0
2021	17.4
2022	11.5
2023	6.0
Thereafter	10.7
Total minimum lease payments	91.3
Rent expense	$ 13.9	$ 34.2	$ 25.5