Leases (Maturities of Operating and Finance Lease Obligations Under Topic 840) (Details) $ in Millions	Dec. 31, 2018 USD ($)
Operating leases
2019	$ 123.9
2020	85.4
2021	66.6
2022	54.3
2023	46.8
Thereafter	178.6
Total payments	555.6
Finance leases
2019	101.4
2020	107.3
2021	96.7
2022	94.5
2023	93.5
Thereafter	464.0
Total payments	$ 957.4