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New Accounting Pronouncements (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jul. 01, 2019
Jul. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease liability recognized upon adoption $ 252.9 $ 252.0  
Operating lease right-of-use assets recognized upon adoption $ 235.8    
Impact of revenue recognition adjustments   0.2 $ 101.3
Retained Earnings      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Impact of revenue recognition adjustments   0.2 $ 102.8
2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right-of-use assets recognized upon adoption   235.4  
2016-02 | Retained Earnings      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Impact of revenue recognition adjustments   $ 0.2