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Net income per share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator:        
Net income $ 4.6 $ 92.7 $ 74.3 $ 80.2
Denominator:        
Weighted-average number of shares-basic (in shares) 53.6 52.6 53.5 52.3
Dilutive securities-equity awards (in shares) 0.4 0.9 0.8 0.9
Weighted-average number of shares-diluted (in shares) 54.0 53.5 54.3 53.2
Net income per share - basic (in dollars per share) $ 0.09 $ 1.76 $ 1.40 $ 1.53
Net income per share - diluted (in dollars per share) $ 0.09 $ 1.73 $ 1.37 $ 1.51
Antidilutive securities excluded from computation of earnings per share (in shares) 1.4 0.4 0.5 0.6