Commitments and Contingencies - Capital and Operating Leases (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) Renewal	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Capital Leased Assets [Line Items]
Capital Lease and Financing Obligations	$ 122.9	$ 30.0
Total rental expense	61.0	$ 38.0	$ 35.0
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019	10.3
2020	10.4
2021	10.5
2022	10.1
2023	10.2
Thereafter	147.2
Total Minimum Lease Payments	198.7
Less: Amount Representing Interest	(75.8)
Present Value of Net Minimum Leases	122.9
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019	61.8
2020	49.8
2021	37.7
2022	30.0
2023	23.3
Thereafter	36.9
Total Minimum Lease Payments	239.5
Finance Lease
Capital Leased Assets [Line Items]
Capital Lease and Financing Obligations	$ 95.0
Initial term of lease contract	20 years
Number of renewals | Renewal	2
Renewal term	5 years
Annual percentage increase in payments	2.00%
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019	$ 7.0