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Recently Issued and Adopted Accounting Pronouncements and Regulatory Items Compensation - Retirement Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Selling, general and administrative expenses $ 790.0 $ 581.7 $ 419.4
Non-operating pension and postretirement charges (income) $ (0.5) (16.3) 23.8
As Reported      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Selling, general and administrative expenses   565.4 443.2
Non-operating pension and postretirement charges (income)   0.0 0.0
Reclassification      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Selling, general and administrative expenses   16.3 (23.8)
Non-operating pension and postretirement charges (income)   $ (16.3) $ 23.8