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Accumulated Other Comprehensive Income (Rollforward) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2020
USD ($)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]  
Balance at December 31, 2019 $ (505.7)
Other comprehensive income (loss) before reclassifications, net of tax (52.5)
Amounts reclassified from accumulated other comprehensive (loss) income, net of tax 4.0
Balance at September 30, 2020 (554.2)
Derivative Financial Instruments  
Accumulated Other Comprehensive Income (Loss) [Roll Forward]  
Balance at December 31, 2019 (0.2)
Other comprehensive income (loss) before reclassifications, net of tax 0.3
Amounts reclassified from accumulated other comprehensive (loss) income, net of tax (0.9)
Balance at September 30, 2020 (0.8)
Foreign Currency Adjustments  
Accumulated Other Comprehensive Income (Loss) [Roll Forward]  
Balance at December 31, 2019 (299.5)
Other comprehensive income (loss) before reclassifications, net of tax (53.7)
Amounts reclassified from accumulated other comprehensive (loss) income, net of tax 0.0
Balance at September 30, 2020 (353.2)
Unrecognized Pension and Other Post-retirement Benefit Costs  
Accumulated Other Comprehensive Income (Loss) [Roll Forward]  
Balance at December 31, 2019 (206.0)
Other comprehensive income (loss) before reclassifications, net of tax 0.9
Amounts reclassified from accumulated other comprehensive (loss) income, net of tax 4.9
Balance at September 30, 2020 $ (200.2)