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Stockholders' Equity - AOCL (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period $ 241,000,000.0 $ 305,900,000 $ 360,400,000 $ 217,500,000
Foreign currency translation adjustments 12,100,000 (6,700,000) (200,000) 300,000
Total other comprehensive loss 0 0 0 0
Balance at end of period 447,300,000 336,500,000 447,300,000 336,500,000
Foreign Currency Translation        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (94,500,000) (84,700,000) (82,200,000) (91,700,000)
Tax expense     0 0
Net amount reclassified to earnings     0 0
Balance at end of period (82,400,000) (91,400,000) (82,400,000) (91,400,000)
Pensions        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (5,500,000) (3,600,000) (5,500,000) (3,600,000)
Net change from period revaluations 0 0 100,000 0
Tax expense 0 0 (100,000) 0
Total other comprehensive gain (loss) before reclassifications, net of tax 0 0 0 0
Net amount reclassified to earnings 0 0 0 0
Tax benefit 0 0 0 0
Total amount reclassified from accumulated other comprehensive loss, net of tax 0 0 0 0
Balance at end of period $ (5,500,000) $ (3,600,000) $ (5,500,000) $ (3,600,000)