Leases - Summary of Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Other non-current assets:
Finance leases - ROU assets	$ 58.2	$ 54.8
Finance leases - Accumulated depreciation	(22.6)	(15.0)
Operating lease right-of-use-assets:
Operating leases - ROU assets	127.4	118.8
Operating leases - Accumulated depreciation	(51.3)	(28.7)
Total lease assets	111.7	129.9
Current portion of long-term debt:
Finance leases	(10.5)	(10.4)
Current portion of operating lease liabilities:
Operating leases	(24.3)	(26.2)
Long-term debt, less current portion:
Finance leases	(23.9)	(28.7)
Long-term operating lease liabilities, less current portion:
Operating leases	(53.2)	(65.7)
Total lease liabilities	$ (111.9)	$ (131.0)
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsNoncurrent	us-gaap:OtherAssetsNoncurrent
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtCurrent	us-gaap:LongTermDebtCurrent
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtNoncurrent	us-gaap:LongTermDebtNoncurrent