Leases - Balance Sheet Effect (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 283.2	$ 245.4
Finance lease assets	60.3
Total leased assets	343.5
Operating lease obligations	55.8	50.8
Finance lease obligations	9.5
Long-term operating lease obligations	241.7	$ 205.4
Finance lease obligations	60.6
Present value of lease obligations	$ 367.6