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Capital Stock (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Aug. 24, 2015 | Aug. 20, 2013 | Aug. 18, 2012
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Shares repurchased (in shares) (less than 0.1 million shares in the three months ended September 30, 2015 and three and six months ended September 30, 2014, repurchased outside of repurchase programs) | 100,000 | 100,000.0 | 100,000 | 100,000 |  |  |
Shares repurchased (in dollars) (less than $1 million in the three months ended September 30, 2015 and 2014, repurchased outside of repurchase programs) | $ 1.0 | $ 1.0 | $ 3.0 | $ 2.0 |  |  |
2015 Stock Repurchase Program |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 500.0 |  |
Shares repurchased (in shares) (less than 0.1 million shares in the three months ended September 30, 2015 and three and six months ended September 30, 2014, repurchased outside of repurchase programs) | 900,000 |  | 900,000 |  |  |  |
Shares repurchased (in dollars) (less than $1 million in the three months ended September 30, 2015 and 2014, repurchased outside of repurchase programs) | $ 30.0 |  | $ 30.0 |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 470.0 |  | $ 470.0 |  |  |  |
2013 Stock Repurchase Program |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  | $ 250.0 |
Shares repurchased (in shares) (less than 0.1 million shares in the three months ended September 30, 2015 and three and six months ended September 30, 2014, repurchased outside of repurchase programs) | 600,000 | 800,000 | 2,000,000 | 3,400,000 |  |  |
Shares repurchased (in dollars) (less than $1 million in the three months ended September 30, 2015 and 2014, repurchased outside of repurchase programs) | $ 20.0 | $ 30.0 | $ 70.0 | $ 130.0 |  |  |
2012 Stock Repurchase Program |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  | $ 2.0
Shares repurchased (in shares) (less than 0.1 million shares in the three months ended September 30, 2015 and three and six months ended September 30, 2014, repurchased outside of repurchase programs) | 800,000 | 0 | 800,000 | 0 |  |  |
Shares repurchased (in dollars) (less than $1 million in the three months ended September 30, 2015 and 2014, repurchased outside of repurchase programs) | $ 25.0 |  | $ 25.0 |  |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 200,000 |  | 200,000 |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 8.0 |  | $ 8.0 |  |  |  |

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