Leases - Right-of-use Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Right-of-use assets:
Operating lease (Other non-current assets)	$ 68.1	$ 39.8
Finance lease (Property, plant and equipment, net)	0.1	0.9
Total right-of-use assets	68.2	40.7
Lease liabilities:
Current portion of operating lease (Other current liabilities)	15.6	11.2
Non-current portion of operating lease (Other non-current liabilities)	56.7	31.6
Finance lease (Debt obligations)	0.1	0.8
Total lease liabilities	$ 72.4	$ 43.6
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Property, plant and equipment, net	Property, plant and equipment, net
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other current liabilities	Other current liabilities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Debt obligations	Debt obligations