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Schedule II - Valuation and Qualifying Accounts - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-09, Allowance, Credit Loss [Member]      
Balance at beginning of year $ 3.6 $ 2.5 $ 2.4
Charged to costs and expenses 2.2 2.5 0.4
Reclassification(1) [1] 0.0 0.5 0.8
Charged to other accounts(2) [2] 0.0 0.0 (0.2)
Deductions(3) [3] (1.2) (1.9) (0.9)
Balance at end of year 4.6 3.6 2.5
Sales Returns and Allowances [Member]      
Balance at beginning of year 1.2 1.3 0.8
Charged to costs and expenses 0.2 0.1 0.7
Deductions(3) [4] (0.4) (0.2) (0.2)
Balance at end of year 1.0 1.2 1.3
SEC Schedule, 12-09, Reserve, Inventory [Member]      
Balance at beginning of year 9.8 5.6 4.1
Charged to costs and expenses 4.4 4.6 1.9
Charged to other accounts(2) [5] 0.2 0.0 (0.1)
Deductions(3) [6] (0.8) (0.4) (0.3)
Balance at end of year 13.6 9.8 5.6
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]      
Balance at beginning of year 6.2 11.5 9.7
Charged to costs and expenses 0.9 (5.2) 2.4
Charged to other accounts(2) [5] 0.4 (0.1) (0.6)
Balance at end of year $ 7.5 $ 6.2 $ 11.5
[1] Includes amount reclassified between Allowance for Doubtful Accounts and Other Receivables related to a customer's open receivables balance for proper classification and acquisition-related adjustments.
[2] Primarily includes impact from foreign currency fluctuations.
[3] Includes accounts determined to be uncollectible and charged against reserves, net of collections on accounts previously charged against reserves.
[4] Includes accounts determined to be uncollectible and charged against reserves, net of collections on accounts previously charged against reserves.
[5] Primarily includes impact from foreign currency fluctuations.
[6] Includes inventory identified as excess, slow moving or obsolete and charged against reserves.