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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]          
Provisional income tax expense     $ 18.3   $ 315.9
Provisional income tax expense for net transition tax     15.1   202.7
Tax expense from remeasurement of deferred tax assets     3.2   $ 113.2
Total before tax $ 109.6 $ 59.3 581.5 $ 165.7  
Income tax expense $ 30.1 $ (11.6) $ 100.4 $ 1.1  
Effective tax rate (percent) 27.50% (19.60%) 17.30% 0.70%  
Discrete items Before Tax:          
Transactions-related charges $ 6.8 $ 48.8 $ 14.8 $ 78.7  
Currency remeasurement 0.0 4.6 3.3 16.1  
Other discrete items 32.8 (4.1) 104.4 83.4  
Tax only discrete items 0.0 0.0 0.0 0.0  
Total discrete items 39.6 49.3 122.5 178.2  
Continuing operations, before discrete items 149.2 108.6 704.0 343.9  
Discrete Items, Tax:          
Transactions-related charges 1.5 15.4 3.1 24.5  
Currency remeasurement 1.8 1.2 3.4 5.4  
Other discrete items 6.1 1.3 13.2 4.6  
Tax only discrete items (17.2) 4.7 (12.4) 5.8  
Total discrete items (7.8) 22.6 7.3 40.3  
Continuing operations, before discrete items $ 22.3 $ 11.0 $ 107.7 $ 41.4  
Effective tax rate percent 14.90% 10.10% 15.30% 12.00%