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Employee Benefits - Plan Assets and Investment Policy (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Employee Benefits    
Weighted-average asset allocations (as a percent) 100.00% 100.00%
Fair value of plan assets $ 104.7 $ 92.2
Investments measured at net asset value (NAV) 2.4 2.7
Total investments at fair value 107.1 94.9
Level 1    
Employee Benefits    
Fair value of plan assets 91.8 63.3
Total investments at fair value 91.8 63.3
Level 2    
Employee Benefits    
Fair value of plan assets 12.9 28.9
Total investments at fair value 12.9 28.9
Equity securities    
Employee Benefits    
Fair value of plan assets 25.1 27.5
Equity securities | Level 1    
Employee Benefits    
Fair value of plan assets 25.1 27.5
U.S. government, state, and agency    
Employee Benefits    
Fair value of plan assets 9.3 11.6
U.S. government, state, and agency | Level 2    
Employee Benefits    
Fair value of plan assets 9.3 11.6
Corporate debt securities    
Employee Benefits    
Fair value of plan assets 3.6 17.3
Corporate debt securities | Level 2    
Employee Benefits    
Fair value of plan assets 3.6 17.3
Mutual funds    
Employee Benefits    
Fair value of plan assets 59.4 32.2
Mutual funds | Level 1    
Employee Benefits    
Fair value of plan assets 59.4 32.2
Cash and cash equivalents    
Employee Benefits    
Fair value of plan assets 7.3 3.6
Cash and cash equivalents | Level 1    
Employee Benefits    
Fair value of plan assets $ 7.3 $ 3.6
Equity securities    
Employee Benefits    
Weighted-average asset allocations (as a percent) 33.00% 51.00%
Debt securities    
Employee Benefits    
Weighted-average asset allocations (as a percent) 60.00% 45.00%
Cash and cash equivalents    
Employee Benefits    
Weighted-average asset allocations (as a percent) 7.00% 4.00%