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Capital Stock, Accumulated Other Comprehensive Loss and Equity - Schedule of Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended | 120 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020
Equity [Abstract] |  |  |  |
Aggregate Repurchases | $ 70.0 | $ 380.4 | $ 705.2 |
Cash paid for Repurchases | $ 70.0 | $ 384.7 | $ 704.9 | $ 4,700.0
Number of Shares | 641,149 | 2,819,081 | 4,308,418 |
Average Price per Share (in dollars per share) | $ 109.22 | $ 134.95 | $ 163.69 | $ 90.07

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