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Stockholders' Equity - AOCL (Details) - USD ($)
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period $ 360,400,000 $ 217,500,000
Foreign currency translation adjustments (23,000,000.0) 4,000,000.0
Total other comprehensive loss 0 0
Balance at end of period 208,400,000 253,500,000
Foreign Currency Translation    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period (82,200,000) (91,700,000)
Tax expense 0 0
Net amount reclassified to earnings 0 0
Balance at end of period (105,200,000) (87,700,000)
Pensions    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period (5,500,000) (3,600,000)
Net change from period revaluations 100,000 0
Tax expense (100,000) 0
Total other comprehensive gain (loss) before reclassifications, net of tax 0 0
Net amount reclassified to earnings 0 0
Tax benefit 0 0
Total amount reclassified from accumulated other comprehensive loss, net of tax 0 0
Balance at end of period $ (5,500,000) $ (3,600,000)