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Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Earnings Per Share [Abstract] |  |  |  |  |
Net income | $ 38.8 | $ 44.7 | $ 99.7 | $ 66.9 |
Weighted average common shares outstanding (in shares) | 73,900,000 | 73,300,000 | 73,600,000 | 72,900,000 |
Dilutive effect of stock options, stock appreciation rights and performance share awards, based on the treasury stock method (in shares) | 1,900,000 | 1,500,000 | 2,100,000 | 1,600,000 |
Weighted average shares assuming dilution (in shares) | 75,800,000 | 74,800,000 | 75,700,000 | 74,500,000 |
Antidilutive options excluded from computation of diluted net income per share (in shares) | 500,000 | 100,000 | 300,000 | 400,000 |
Stock repurchase program, shares authorized |  |  |  |  | 800,000
Stock repurchase program, shares purchased | 0 |  | 325,000 |  |
Stock repurchase program, cost of shares purchased | $ 0.0 |  | $ 26.9 |  |
Stock repurchase program, average price per share | $ 0.00 |  | $ 82.84 |  |

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