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Employee Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Cash          
Components of net periodic benefit cost          
Deferred compensation, Rabbi Trust $ 6.6   $ 6.6   $ 6.1
Short-term Investments          
Components of net periodic benefit cost          
Deferred compensation, Rabbi Trust 6.3   6.3   $ 5.5
Defined Benefit Plans          
Components of net periodic benefit cost          
Service cost 0.7 $ 0.7 2.2 $ 2.1  
Interest cost 1.1 1.6 3.4 4.6  
Expected return on plan assets (2.4) (2.4) (7.3) (7.2)  
Amortization of unrecognized loss 1.3 0.8 4.0 2.5  
Net periodic benefit cost 0.7 0.7 2.3 2.0  
Amortization of unrecognized actuarial loss, provision for income tax $ (0.4) $ (0.2) $ (1.0) $ (0.6)