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Summary of Significant Accounting Policies, Recent Accounting Pronouncements (Details) - USD ($)
$ in Millions
Oct. 01, 2018
Jan. 01, 2019
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
New Accounting Pronouncements          
Retained earnings     $ 3,028.7   $ 2,941.5
Impact of ASU 2014-09 | Impact of ASU 2014-09 adoption - Increase (decrease) to beginning retained earnings          
New Accounting Pronouncements          
Retained earnings       $ 3.2  
Impact of ASU 2016-02          
New Accounting Pronouncements          
Retained earnings   $ 0.0      
ROU assets   180.0      
Lease liabilities   $ 180.0      
ASU 2018-02          
New Accounting Pronouncements          
Reclassification of the stranded tax effects of the Tax Act $ 23.5