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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Millions, $ in Millions
Jun. 30, 2024
Dec. 31, 2023
Statement of Financial Position [Abstract]    
Property, equipment and capitalized software, accumulated depreciation $ 597.0 $ 544.2
Accumulated amortization $ 1,457.5 $ 1,359.1
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 175.0 175.0
Common stock, shares issued (in shares) 50.3 49.9
Common stock, shares, outstanding (in shares) 41.5 41.9
Treasury stock, shares (in shares) 8.8 8.0