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Shareholders' Equity - Share Repurchases (Details) - USD ($) $ in Millions | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jul. 28, 2016 | Oct. 29, 2015 | Dec. 12, 2012
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Repurchases of common stock | $ 290.5 | $ 168.7 |  |  |
Common Stock Repurchase 2012 Authorization |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Number of shares authorized to be repurchased (in shares) |  |  |  |  | 8,000,000
Stock repurchased during period (in shares) |  | 2,000,000 |  |  |
Repurchases of common stock |  | $ 168.7 |  |  |
Remaining authorized repurchase amount (shares) | 0 |  |  |  |
Common Stock Repurchase 2015 Authorization |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Number of shares authorized to be repurchased (in shares) |  |  |  | 6,000,000 |
Stock repurchased during period (in shares) | 3,800,000 |  |  |  |
Repurchases of common stock | $ 290.5 |  |  |  |
Remaining authorized repurchase amount (shares) | 1,500,000 |  |  |  |
Subsequent Event |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Number of shares authorized to be repurchased (in shares) |  |  | 6,000,000 |  |

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