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Supplemental Disclosures (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for Doubtful Accounts      
Beginning balance $ 1.0 $ 0.8 $ 0.4
Bad debt expense 1.2 0.8 0.4
Recoveries (0.2) 0.0 0.0
Write-offs and discounts (0.3) (0.6) 0.0
Ending balance 1.7 1.0 0.8
Interest paid 24.0 22.7 13.3
Income taxes paid 23.2 38.1 31.9
Capital spending in accounts payable and accrued liabilities 5.0 7.7 8.8
Deferred contingent business acquisition consideration $ 0.0 $ 8.6 $ 0.0