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Unaudited Condensed Consolidated Financial Statements New Accounting Pronouncements or Changes in Accounting Principle (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating Lease, Liability $ 70.1    
Operating Lease, Right-of-Use Asset $ 57.1   $ 0.0
Accounting Standards Update 2016-02 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating Lease, Liability   $ 64.6  
Operating Lease, Right-of-Use Asset   $ 53.7