Fair Value Measurements - Assets and liabilities that were recognized at fair value on a recurring basis (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Liabilities
Other Employee-related Liabilities, Current	$ 9.8	$ 152.4
Warrants and Rights Outstanding	127.4	227.8
Recurring
Assets
Employee phantom share receivable asset	14.1	4.2
Liabilities
Total	142.5	380.9
Other Employee-related Liabilities, Current	9.8	152.4
Warrants and Rights Outstanding	127.4	227.8
Recurring | Level 2
Assets
Employee phantom share receivable asset	14.1	4.2
Liabilities
Total	15.1	153.1
Other Employee-related Liabilities, Current	9.8	152.4
Recurring | Level 3
Liabilities
Total	127.4	227.8
Warrants and Rights Outstanding	127.4	227.8	$ 258.0	$ 312.8
Interest rate swap asset
Assets
Forward currency contracts asset	14.0	2.0
Liabilities
Interest rate swap liability		2.0
Interest rate swap asset | Recurring
Assets
Forward currency contracts asset	14.0
Foreign exchange forward
Assets
Forward currency contracts asset	0.1	2.2
Liabilities
Interest rate swap liability	(5.3)	(0.7)
Foreign exchange forward | Recurring
Assets
Foreign Currency Contract, Asset, Fair Value Disclosure	0.1	2.2
Liabilities
Foreign Currency Contracts, Liability, Fair Value Disclosure	5.3	0.7
Foreign exchange forward | Recurring | Level 2
Assets
Foreign Currency Contract, Asset, Fair Value Disclosure	0.1	2.2
Liabilities
Foreign Currency Contracts, Liability, Fair Value Disclosure	$ 5.3	$ 0.7