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Recently Issued and Adopted Accounting Pronouncements and Regulatory Items Revenue From Contracts With Customers (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Assets      
Prepaid and other current assets $ 432.6 $ 388.3 $ 303.5
Liabilities and Equity      
Accrued and other liabilities 570.8 564.2 479.4
Amounts as originally reported      
Assets      
Prepaid and other current assets 382.9   303.5
Liabilities and Equity      
Accrued and other liabilities 521.1   $ 479.4
Accounting Standards Update 2014-09 | Adjustment      
Assets      
Prepaid and other current assets (49.7) 84.8  
Liabilities and Equity      
Accrued and other liabilities $ (49.7) $ 84.8