Lease Arrangements (Schedule of Future Minimum Lease Commitments) (Details) $ in Millions	Dec. 31, 2017 USD ($)
Capital Leases
2018	$ 9.4
2019	5.9
2020	4.3
2021	1.3
2022	0.1
Thereafter	0.0
Total minimum lease payments	21.0
Amounts representing interest	(0.7)
Present value of minimum lease payments	20.3
Current maturities	(9.1)
Long-term capital lease obligations	11.2
Operating leases
2018	17.8
2019	13.5
2020	8.9
2021	5.8
2022	4.8
Thereafter	13.3
Total minimum lease payments	$ 64.1