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Shareholders' Equity - Share Repurchases (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Aug. 03, 2018 | Jul. 31, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Shares repurchased during period (in shares) | 1,000,000 | 1,100,000 |  |
Total cost of shares repurchased | $ 113.2 | $ 115.8 |  |
2016 Authorization |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Shares authorized to be repurchased (in shares) |  |  |  | 6,000,000
Shares remaining authorized for repurchase (in shares) | 1,800,000 |  |  |
Subsequent Event | Common Stock Repurchase 2018 Authorization |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Shares authorized to be repurchased (in shares) |  |  | 6,000,000.0 |

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