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Stockholders' Equity - AOCL (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period $ 305,900,000 $ 157,700,000 $ 217,500,000 $ 112,500,000
Foreign currency translation adjustments (6,700,000) 2,400,000 300,000 (8,700,000)
Total other comprehensive loss 0 0 0 (600,000)
Balance at end of period 336,500,000 209,500,000 336,500,000 209,500,000
Foreign Currency Translation        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (84,700,000) (83,900,000) (91,700,000) (72,800,000)
Tax (expense) benefits     0 0
Net amount reclassified to earnings     0 0
Balance at end of period (91,400,000) (81,500,000) (91,400,000) (81,500,000)
Accumulated Other Comprehensive Loss        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (88,300,000) (87,200,000) (95,300,000) (75,500,000)
Foreign currency translation adjustments (6,700,000) 2,400,000 300,000 (8,700,000)
Balance at end of period (95,000,000.0) (84,800,000) (95,000,000.0) (84,800,000)
Pensions        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (3,600,000) (3,300,000) (3,600,000) (2,700,000)
Net change from period revaluations 0 0 0 0
Tax (expense) benefits 0 0 0 0
Total other comprehensive gain (loss) before reclassifications, net of tax 0 0 0 0
Net amount reclassified to earnings 0 0 0 0
U.S. tax reform - reclassification to retained earnings upon adoption of ASU No. 2018-02 0 0 0 (500,000)
Tax benefit 0 0 0 (100,000)
Total amount reclassified from accumulated other comprehensive loss, net of tax 0 0 0 (600,000)
Balance at end of period $ (3,600,000) $ (3,300,000) $ (3,600,000) $ (3,300,000)