Leases - Future Minimum Lease Payments (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 monthly_payment	Dec. 31, 2018 USD ($)
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019		$ 21.0
2020		19.3
2021		16.2
2022		14.3
2023		11.6
Thereafter		63.4
Total minimum lease payments		145.8
Less: interest		(44.6)
Capital lease obligations		101.2
Less: current portion		(13.4)
Long-term capital lease obligations		87.8
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019		91.2
2020		92.8
2021		75.7
2022		67.6
2023		55.2
Thereafter		210.5
Total minimum lease payments		$ 593.0
Forecast
Operating Leased Assets [Line Items]
Number of monthly obligation payments in fiscal year | monthly_payment	13