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Supplementary Data Share Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Feb. 14, 2018 | Feb. 10, 2017
Disclosure of Repurchase Agreements [Abstract] |  |  |  |
Stock repurchase program, authorized amount |  |  | $ 300.0 | $ 300.0
Number of shares repurchased | 5.0 | 4.8 |  |
Aggregate cost, including fees | $ 114.5 | $ 115.0 |  |
Average price per share, including fees | $ 23.02 | $ 24.13 |  |
Stock repurchase program, remaining authorized repurchase amount, excluding fees | $ 341.0 |  |  |

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