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Shareholders' Equity - Accumulated Other Comprehensive Income (Loss) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Summary of the components of accumulated other comprehensive income, net of tax  
Balance at beginning of period $ 917.1
Balance at end of period 924.6
Accumulated Other Comprehensive Income (Loss)  
Summary of the components of accumulated other comprehensive income, net of tax  
Balance at beginning of period (25.5)
Other comprehensive income 1.2
Realized loss on reclassification 1.0
Net current period other comprehensive income (loss) 2.2
Balance at end of period (23.3)
Foreign Currency Translation  
Summary of the components of accumulated other comprehensive income, net of tax  
Balance at beginning of period 27.4
Other comprehensive income (12.3)
Net current period other comprehensive income (loss) (12.3)
Balance at end of period 15.1
Pension Liability Adjustment  
Summary of the components of accumulated other comprehensive income, net of tax  
Balance at beginning of period (52.9)
Other comprehensive income 13.5
Realized loss on reclassification 1.0
Net current period other comprehensive income (loss) 14.5
Balance at end of period $ (38.4)