Operating Leases (Future Minimum Lease Payments) (Details) $ in Millions	Dec. 31, 2017 USD ($)
Property Subject to or Available for Operating Lease [Line Items]
2018	$ 133.8
2019	94.6
2020	57.9
2021	27.1
2022	9.3
2023 and thereafter	2.0
Total minimum lease payments	324.7
Leased Facilities and Equipment [Member]
Property Subject to or Available for Operating Lease [Line Items]
2018	96.8
2019	70.9
2020	47.5
2021	25.2
2022	9.3
2023 and thereafter	2.0
Total minimum lease payments	251.7
Leased Vehicles [Member]
Property Subject to or Available for Operating Lease [Line Items]
2018	37.0
2019	23.7
2020	10.4
2021	1.9
2022	0.0
2023 and thereafter	0.0
Total minimum lease payments	$ 73.0