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Share Repurchases (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended | 56 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | May 14, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Accrued liabilities | $ 1,233.1 | $ 1,081.9 |  | $ 1,081.9 |
Payments for Repurchase of Common Stock | $ 0.0 | $ 149.9 | $ 0.0 |  |
2015 Repurchase Program |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  | $ 1,500.0
Stock Repurchased and Retired During Period, Shares | 0.0 |  |  | 22.9 |
Payments for Repurchase of Common Stock |  |  |  | $ 800.0 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 700.0 |  |  |  |

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