Leases - Schedule of Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease cost	$ 48.6	$ 51.8
Finance lease cost:
Amortization of leased assets	14.0	6.0
Interest on lease liabilities	3.9	2.2
Short-term lease cost	1.5	1.7
Variable lease cost	5.9	20.7
Net lease cost	$ 73.9	$ 82.4
Weighted-average Remaining Lease Term [Abstract]
Weighted-average remaining lease term (years), operating	7 years 3 months 18 days	7 years 3 months 18 days
Weighted-average remaining lease term (years), finance	7 years 4 months 24 days	7 years 7 months 6 days
Weighted-average Discount Rate [Abstract]
Weighted-average discount rate, opeating	4.70%	4.90%
Weighted-average discount rate, finance	4.70%	4.80%
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows used by operating leases	$ 48.5	$ 51.3
Operating cash flows used by finance leases	3.8	2.2
Financing cash flows used by finance leases	13.1	5.6	$ 3.0
Lease liabilities arising from obtaining new ROU assets:
Lease liabilities arising from obtaining new ROU assets, operating leases	41.8	11.1
Lease liabilities arising from obtaining new ROU assets, finance leases	$ 41.3	$ 41.9