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Stockholders' Equity - AOCL (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period $ 318,300,000 $ 200,000,000.0 $ 504,600,000 $ 360,400,000
Foreign currency translation adjustments 6,700,000 10,700,000 (4,100,000) (12,300,000)
Total other comprehensive loss 0 0 0 0
Balance at end of period 401,600,000 241,300,000 401,600,000 241,300,000
Foreign Currency Translation        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (69,400,000) (105,200,000) (58,600,000) (82,200,000)
Tax expense     0 0
Net amount reclassified to earnings     0 0
Balance at end of period (62,700,000) (94,500,000) (62,700,000) (94,500,000)
Pensions        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (6,900,000) (5,500,000) (6,900,000) (5,500,000)
Net change from period revaluations 0 0 0 100,000
Tax expense 0 0 0 (100,000)
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 $ (6,900,000) $ (5,500,000) $ (6,900,000) $ (5,500,000)