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Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |
Net income | $ 56.3 | $ 66.1 | $ 55.4 | $ 55.2 | $ 56.1 | $ 43.6 | $ 177.8 | $ 154.9 |
Weighted average common shares outstanding (in shares) | 74,000,000.0 |  |  | 73,900,000 |  |  | 73,900,000 | 73,900,000 |
Dilutive effect of equity awards, based on the treasury stock method (in shares) | 1,500,000 |  |  | 1,800,000 |  |  | 1,400,000 | 1,500,000 |
Weighted average shares assuming dilution (in shares) | 75,500,000 |  |  | 75,700,000 |  |  | 75,300,000 | 75,400,000 |
Antidilutive options excluded from computation of diluted net income per share (in shares) | 100,000 |  |  | 100,000 |  |  | 300,000 | 400,000 |
Stock repurchase program, shares authorized |  |  |  |  |  |  |  |  | 800,000
Stock repurchase program, shares purchased |  |  |  |  |  |  | 800,000 |  |
Stock purchase program, cost of shares purchased |  |  | $ 83.1 |  | $ 22.9 | $ 47.9 | $ 83.1 |  |
Stock repurchase program, average price per share |  |  |  |  |  |  | $ 103.89 |  |

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