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Accumulated Other Comprehensive Income (Loss) (Rollforward) (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2021
USD ($)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]  
Balance at start of period $ 742.7
Other comprehensive income (loss) before reclassifications, net of tax 4.9
Amounts reclassified from accumulated other comprehensive income, net of tax 7.2
Balance at end of period 780.7
Accumulated Other Comprehensive Income (Loss)  
Accumulated Other Comprehensive Income (Loss) [Roll Forward]  
Balance at start of period (564.2)
Balance at end of period (552.1)
Derivative Financial Instruments  
Accumulated Other Comprehensive Income (Loss) [Roll Forward]  
Balance at start of period (3.1)
Other comprehensive income (loss) before reclassifications, net of tax 2.3
Amounts reclassified from accumulated other comprehensive income, net of tax 2.0
Balance at end of period 1.2
Foreign Currency Adjustments  
Accumulated Other Comprehensive Income (Loss) [Roll Forward]  
Balance at start of period (318.8)
Other comprehensive income (loss) before reclassifications, net of tax 3.7
Amounts reclassified from accumulated other comprehensive income, net of tax 0.0
Balance at end of period (315.1)
Unrecognized Pension and Other Post-retirement Benefit Costs  
Accumulated Other Comprehensive Income (Loss) [Roll Forward]  
Balance at start of period (242.3)
Other comprehensive income (loss) before reclassifications, net of tax (1.1)
Amounts reclassified from accumulated other comprehensive income, net of tax 5.2
Balance at end of period $ (238.2)