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Recently Issued and Adopted Accounting Pronouncements and Regulatory Items - Revenue Recognition (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Assets      
Prepaid and other current assets $ 417.4 $ 411.2 $ 326.4
Liabilities and Equity      
Accrued and other liabilities 572.1 582.5 497.7
Calculated under Revenue Guidance in Effect before Topic 606 [Member]      
Assets      
Prepaid and other current assets 360.2   326.4
Liabilities and Equity      
Accrued and other liabilities 514.9   $ 497.7
Accounting Standards Update 2014-09 | Amounts without ASC 606 adjustment      
Assets      
Prepaid and other current assets (57.2) 84.8  
Liabilities and Equity      
Accrued and other liabilities $ (57.2) $ 84.8