Leases - Right-of-use Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Right-of-use assets:
Operating lease (Other non-current assets)	$ 72.2	$ 39.8
Finance lease (Property, plant and equipment, net)	0.3	0.9
Total right-of-use assets	72.5	40.7
Lease liabilities:
Current portion of operating lease (Other current liabilities)	16.2	11.2
Non-current portion of operating lease (Other non-current liabilities)	60.4	31.6
Finance lease (Debt obligations)	0.2	0.8
Total lease liabilities	$ 76.8	$ 43.6
Operating lease (Other non-current assets)	us-gaap:OtherAssets	us-gaap:OtherAssets
Finance lease (Property, plant and equipment, net)	Property, plant and equipment, net	Property, plant and equipment, net
Current portion of operating lease (Other current liabilities)	Other current liabilities	Other current liabilities
Non-current portion of operating lease (Other non-current liabilities)	Other liabilities	Other liabilities
Finance lease (Debt obligations)	Debt obligations	Debt obligations