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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Provisional income tax expense $ 0.8   $ 315.9
Provisional income tax expense for net transition tax     202.7
Tax expense from remeasurement of deferred tax assets     $ 113.2
Total before tax 331.8 $ 54.4  
Income tax expense $ 68.7 $ 9.4  
Effective tax rate (percent) 20.70% 17.30%  
Discrete Items, Before Tax:      
Acquisition related charges $ 2.7 $ 9.2  
Currency remeasurement 0.5 5.1  
Other discrete items (51.5) 38.1  
Tax only discrete items 0.0 0.0  
Total discrete items (48.3) 52.4  
Continuing operations, before discrete items 283.5 106.8  
Discrete Items, Tax:      
Acquisition related charges 0.6 2.6  
Currency remeasurement 0.9 2.6  
Other discrete items (17.7) 2.1  
Tax only discrete items (7.4) (4.0)  
Total discrete items (23.6) 3.3  
Continuing operations, before discrete items $ 45.1 $ 12.7  
Effective tax rate percent 15.90% 11.90%