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Income Taxes, Tax Liability and Uncertainties (Details)
$ in Millions
Dec. 31, 2018
USD ($)
country
city
state
Dec. 31, 2017
USD ($)
Income tax liability [Abstract]    
Net current liability for income tax $ 59.1 $ 35.9
Current receivable 156.2 144.7
Current payable 215.3 108.8
Liability for Uncertain Tax Positions, Noncurrent $ 171.2 $ 177.6
Income tax uncertainties [Abstract]    
Number of states where company or one of its subsidiaries files income tax returns | state 46  
Number of cities where company or one of its subsidiaries files income tax returns | city 25  
Number of other countries the company or one of its subsidiaries files income tax returns | country 81