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Recently Issued and Adopted Accounting Pronouncements and Regulatory Items - ASU 2017-07 Reclassifications (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Selling, general and administrative expenses $ 207.6 $ 154.5 $ 619.4 $ 399.3
Non-operating pension and postretirement charges (income) $ (1.2) (3.6) $ (0.5) (12.3)
As Reported        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Selling, general and administrative expenses   150.9   387.0
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   (3.6)   (12.3)
Non-operating pension and postretirement charges (income)   3.6   12.3
Accounting Standards Update 2017-07        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Non-operating pension and postretirement charges (income)   $ (3.6)   $ (12.3)