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Basis of Presentation Basis of Presentation - Textual (Details)
$ in Millions
Mar. 31, 2019
USD ($)
state
Dec. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Number of states in which entity operates | state 37      
Total assets $ 5,583.8 [1] $ 5,175.0    
Liabilities 3,694.3 3,356.3    
Capital in excess of par value 1,616.5 1,557.0 $ 1,409.9 $ 1,395.4
Adoption of ASC 842 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Total assets 349.0      
Liabilities 347.0      
Capital in Excess of Par Value        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Capital in excess of par value 2,551.3 $ 2,588.7 $ 2,685.9 $ 2,747.4
Capital in Excess of Par Value | Adoption of ASC 842 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Capital in excess of par value $ 2.0      
[1] Our consolidated assets as of March 31, 2019 and December 31, 2018 include total assets of variable interest entities of $216.2 million and $197.5 million, respectively, which cannot be used by us to settle the obligations of other entities. Our consolidated liabilities as of March 31, 2019 and December 31, 2018 include total liabilities of the variable interest entities of $62.2 million and $50.8 million, respectively. See Note 3, Variable Interest Entities.