Leases - Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ (10.1)	$ (10.3)
Supplemental non-cash information on lease liabilities arising from obtaining right-of-use assets:
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 0.9	$ 0.3