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Shareholders' Equity - Share Repurchases (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Aug. 31, 2018 | Jul. 31, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Shares repurchased during period (in shares) | 3,100,000 | 1,700,000 |  |
Total cost of shares repurchased | $ 299.2 | $ 178.0 |  |
Common Stock Repurchase 2018 Authorization |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Shares authorized to be repurchased (in shares) |  |  | 6,000,000.0 |
Shares repurchased during period (in shares) | 300,000 |  |  |
Shares remaining authorized for repurchase (in shares) | 5,700,000 |  |  |
2016 Authorization |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Shares authorized to be repurchased (in shares) |  |  |  | 6,000,000
Shares repurchased during period (in shares) | 2,800,000 |  |  |
Shares remaining authorized for repurchase (in shares) | 0 |  |  |

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