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Stock Repurchases, Dividends and Earnings per Share - Share Repurchase Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Equity [Abstract]        
Number of shares repurchased (in shares) 0 300,000 1,600,000 400,000
Amount paid $ 0.0 $ 27.4 $ 203.5 $ 40.1
Weighted average cost per share (in dollars per share) $ 0 $ 108.68 $ 124.02 $ 101.84