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Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$ 6.8	$ 9.3	$ 19.6	$ 33.3
Operating cash flows for finance leases	0.1	0.4	0.3	1.2
Financing cash flows for finance leases	2.1	8.2	7.9	18.4
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	0.8	5.8	2.1	6.3
Finance leases	$ 0.8	$ 0.1	$ 0.9	$ 0.1

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Operating cash flows for finance leases

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Amount of cash outflow for principal payment on finance lease.

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