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Stockholders' Equity - AOCI (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period $ 360,400,000 $ 217,500,000 $ 112,500,000
Other comprehensive loss:      
Other comprehensive income (loss), net of tax 22,200,000 7,600,000 (19,800,000)
Balance at ending of period 504,600,000 360,400,000 217,500,000
Foreign Currency Translation      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (82,200,000) (91,700,000) (72,800,000)
Other comprehensive loss:      
Net amount reclassified to earnings 0 0 0
Tax expense 0 0 0
Other comprehensive income (loss), net of tax 23,600,000 9,500,000 (18,900,000)
Balance at ending of period (58,600,000) (82,200,000) (91,700,000)
Pension Benefits      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (5,500,000) (3,600,000) (2,700,000)
Other comprehensive loss:      
Net change from period revaluation (1,800,000) (2,600,000) (400,000)
Tax benefit 400,000 700,000 100,000
Total other comprehensive loss before reclassifications, net of tax (1,400,000) (1,900,000) (300,000)
Net amount reclassified to earnings 0 0 0
U.S tax reform - reclassification to retained earnings upon adoption of ASU No. 2018-02 0 0 (500,000)
Tax expense 0 0 (100,000)
Total amount reclassified from accumulated other comprehensive loss, net of tax 0 0 (600,000)
Other comprehensive income (loss), net of tax (1,400,000) (1,900,000) (900,000)
Balance at ending of period $ (6,900,000) $ (5,500,000) $ (3,600,000)