Leases - Maturity of Lease Liabilities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019 (remaining period of year)	$ 19.0
2020	67.5
2021	53.3
2022	43.3
2023	37.0
Thereafter	183.6
Total future minimum operating lease payments	403.7
Less imputed interest	131.0
Total operating lease liabilities	272.7
Less current portion of operating lease liabilities	53.6	$ 0.0
Long-term operating lease liabilities	$ 219.1	$ 0.0
Minimum [Member]
Lessee, Lease Liability, Maturity [Line Items]
Lessee, Operating Lease, Renewal Term	1 year
Maximum [Member]
Lessee, Lease Liability, Maturity [Line Items]
Lessee Remaining Lease Term	19 years
Lessee, Operating Lease, Renewal Term	32 years