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Business Segment Information (Reconciliation of Equity Affiliates' Income) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Tax reform repatriation - equity method investment   $ (32.5) $ (28.5)
Equity affiliates' income $ 52.9 13.8  
Segment Reconciling Items      
Segment Reporting Information [Line Items]      
Tax reform repatriation - equity method investment 0.0 (32.5)  
Segment Total      
Segment Reporting Information [Line Items]      
Equity affiliates' income $ 52.9 $ 46.3