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Recent Authoritative Accounting Guidance - New Accounting Pronouncements and Changes in Accounting Principles (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Reduction in income tax expense   $ 0.0
Accounting Standards Update 2016-02 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Operating Lease, Right-of-Use Asset $ 54.6  
Operating Lease, Liability 54.6  
Accounting Standards Update 2018-02 | Adjustments for New Accounting Principle, Early Adoption    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Tax Cuts And Jobs Act Of 2017, Reclassification From AOCI To Retained Earnings $ 3.1