Leases - Supplemental Cash Flow Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases [Abstract]
Operating lease cost	$ 32.6
Variable lease cost	2.2
Cash paid for amounts included in measurement of operating lease liabilities - operating cash flows	24.3
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 21.0