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Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
NOL and Tax Credit Carryforwards [Line Items]              
Foreign earnings inclusion, Global Intangible Low-Taxed Income (GILTI)         $ 16.8 $ 25.7  
Repatriation of foreign earnings (GILTI )       $ 0.2 3.5 5.4  
Restructuring       0.0 4.2 0.0  
Valuation allowance       335.5 (90.1) (48.0)  
Valuation allowance decrease due to change in judgment on the realizability of deferred tax assets $ (26.0) $ 99.0 $ (41.9)   (45.1)    
Accumulated other comprehensive loss, net of tax 1,223.6   1,201.7 1,223.6 1,201.7 1,133.8 $ 1,027.8
Tax expense for the recognition of a stranded deferred tax balance arising from deferred tax valuation allowances that was associated with a cash flow hedge portfolio     6.0        
Transition tax expense           5.9  
Impairment of goodwill   $ 287.0   287.0 0.0 0.0  
Goodwill impairment       50.4 0.0 0.0  
Deferred taxes for foreign withholding taxes 4.4     4.4      
Accumulated Deferred Tax Asset Valuation Allowance              
NOL and Tax Credit Carryforwards [Line Items]              
Accumulated other comprehensive loss, net of tax $ 50.3   $ 41.5 $ 50.3 $ 41.5 $ 49.3 $ 28.8