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Basis of Presentation and Significant Accounting Policies (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member          
Reduction to opening retained earnings $ 1,818.3 $ 1,850.1 $ 1,893.9 $ 1,815.6 $ 1,855.8 $ 1,831.6
Retained Earnings            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Reduction to opening retained earnings $ 1,768.6 $ 1,785.1 1,761.3 $ 1,669.7 $ 1,639.3 $ 1,606.1
Cumulative Effect, Period of Adoption, Adjustment            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Reduction to opening retained earnings     (11.1)      
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Reduction to opening retained earnings     $ (11.1)