Leases - Expense (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases [Abstract]
Operating lease expense	$ 63.8
Short-term lease expense	9.0
Variable lease expense	18.8
Finance lease expense:
Amortization of right-of-use assets	8.5
Interest on lease obligations	4.7
Total lease expense	$ 104.8