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Shareholders' Equity - Share Repurchases (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jul. 28, 2016 | Oct. 29, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Shares repurchased during period (in shares) | 1,100,000 | 3,800,000 |  |
Total cost of shares repurchased | $ 115.8 | $ 290.5 |  |
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) | 3,600,000 |  |  |
2015 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) | 0 |  |  |

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