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Condensed Consolidated Statements of Cash Flows (Parenthetical) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Capital expenditures incurred but not yet paid $ 10.6 $ 7.6  
Treasury stock purchased but not yet paid 10.0 $ 24.8  
Other Current Assets [Member]      
Restricted Cash 0.8   $ 0.9
Other Assets [Member]      
Restricted Cash $ 6.9   $ 6.9