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Leases - Supplemental Income Statement Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating lease cost:    
Operating leases $ 28.8 $ 43.3
Short-term leases 39.1 49.7
Variable leases 4.6 19.1
Sublease income (2.3) (2.6)
Total operating lease cost 70.2 109.5
Finance leases:    
Amortization of right-of-use assets 3.5 15.3
Interest on lease liabilities 0.8 1.5
Total finance lease cost $ 4.3 $ 16.8