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Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Thousands, $ in Millions
Jun. 30, 2019
Dec. 31, 2018
Consolidated Balance Sheets    
Accounts receivable, allowances for doubtful accounts and billing adjustments $ 6.1 $ 6.0
Other intangible assets, accumulated amortization 891.1 802.0
Intangible assets - computer software, accumulated amortization 955.2 893.4
Property and equipment, accumulated depreciation and amortization $ 530.4 $ 522.7
Common stock, par value (in dollars per share) $ 0.10 $ 0.10
Common stock, authorized (in shares) 600,000 600,000
Common stock, issued (in shares) 202,765 202,765
Common stock, outstanding (in shares) 176,977 180,586
Treasury stock (in shares) 25,788 22,179