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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 | 96 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Aggregate Repurchases | $ 705.2 | $ 454.4 | $ 658.8 |
Cash paid for Repurchases | $ 704.9 | $ 450.5 | $ 658.8 | $ 4,200.0
Number of Shares | 4,308,418 | 3,014,131 | 5,816,363 |
Average Price per Share (in dollars per share) | $ 163.69 | $ 150.77 | $ 113.26 | $ 87.20
Purchases prior to the increased authorization |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Aggregate Repurchases | $ 5.1 |  |  |

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