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Net Income Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share [Abstract]    
Net income $ 22.1 $ 32.9
Weighted average common shares outstanding (in shares) 72,500,000 71,700,000
Dilutive effect of stock options, stock appreciation rights and performance share awards, based on the treasury stock method (in shares) 1,600,000 1,600,000
Weighted average shares assuming dilution (in shares) 74,100,000 73,300,000
Antidilutive options excluded from computation of diluted net income per share (in shares) 600,000 800,000
Stock repurchase program, shares authorized 700,000  
Stock repurchase program, shares purchased 142,800  
Stock repurchase program, cost of shares purchased $ 9.1  
Stock repurchase program, average price per share $ 63.66