Leases - Balance Sheet Effect (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Assets
Operating lease assets	$ 464.5	$ 304.3
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, plant and equipment, net	Property, plant and equipment, net
Finance lease assets	$ 64.2	$ 61.2
Total leased assets	$ 528.7	$ 365.5
Short-term:
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued Liabilities, Current	Accrued Liabilities, Current
Operating lease obligations	$ 98.2	$ 61.0
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Current portion of long-term debt	Current portion of long-term debt
Finance lease obligations	$ 13.6	$ 11.4
Long-term:
Long-term operating lease obligations	$ 413.5	$ 275.1
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Long-term debt, net	Long-term debt, net
Finance lease obligations	$ 60.9	$ 60.0
Present value of lease obligations	$ 586.2	$ 407.5