Leases - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Feb. 07, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right of use assets		$ 72.9	$ 87.9
Operating lease liability		91.7	93.6
Operating lease liability		91.7	93.6
Right-of-use assets recognized during period		12.9
Operating lease liabilities recognized during period		12.9
Impairment of operating leases		14.8
Cash paid for operating leases	$ 5.9	$ 28.1	$ 23.7
Rent expense under operating leases				$ 32.9
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right of use assets					$ 91.9
Operating lease liability					112.9
Operating lease liability					$ 112.9