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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Total assets [1] $ 6,445.9 $ 6,080.7
Total liabilities $ 4,444.3 $ 4,148.0
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) 113,835,708 113,230,774
Treasury stock, shares (in shares) 14,428,235 14,637,858
Variable Interest Entity, Primary Beneficiary    
Total assets $ 221.2 $ 215.0
Total liabilities $ 46.8 $ 41.1
[1] Our consolidated assets as of December 31, 2020 and December 31, 2019 include total assets of variable interest entities of $221.2 million and $215.0 million, respectively, which cannot be used by us to settle the obligations of other entities. Our consolidated liabilities as of December 31, 2020 and December 31, 2019 include total liabilities of the variable interest entities of $46.8 million and $41.1 million, respectively. See Note 3, Variable Interest Entities.