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Leases - Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 35.2	$ 41.6
Operating cash flows from finance leases	7.0	4.8
Financing cash flows from finance leases	6.3	3.8
ROU assets obtained in exchange for lease obligations:
Operating leases, initial recognition	4.3	34.0
Operating leases, modifications and remeasurements	9.7	(9.1)
Finance leases, initial recognition	15.7	29.6
Finance leases, modifications and remeasurements	$ 31.8	$ 8.2

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Amount of interest paid on finance lease liability.

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Amount of cash outflow for principal payment on finance lease.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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