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Retirement Benefits - Amounts Recognized in Combined Balance Sheet (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Amounts recognized in the consolidated balance sheet consisted of:    
Accrued retirement benefits $ (82.5) $ (109.1)
Pension Plans    
Amounts recognized in the consolidated balance sheet consisted of:    
Noncurrent assets 2.1 2.3
Other current liabilities (0.3) (0.3)
Accrued retirement benefits (77.5) (105.2)
Accumulated other comprehensive (income) loss before income taxes (28.2) 1.3
Net amount recognized $ (103.9) $ (101.9)