Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions		Dec. 31, 2021	Dec. 31, 2020
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01
Common stock, shares authorized (in shares)		200,000,000	200,000,000
Common stock, shares issued (in shares)		114,211,057	113,835,708
Treasury stock, shares (in shares)		14,719,662	14,428,235
Assets	[1]	$ 6,864.9	$ 6,445.9
Total liabilities		4,465.7	4,444.3
Variable Interest Entity, Primary Beneficiary
Assets		226.2	221.2
Total liabilities		$ 38.2	$ 46.8

[1] Our consolidated assets as of December 31, 2021 and December 31, 2020 include total assets of variable interest entities of $226.2 million and $221.2 million, respectively, which cannot be used by us to settle the obligations of other entities. Our consolidated liabilities as of December 31, 2021 and December 31, 2020 include total liabilities of the variable interest entities of $38.2 million and $46.8 million, respectively. See Note 3, Variable Interest Entities.