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Employee Benefits - Schedule of Pension Assets at Fair Value Hierarchy Level (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Pension assets at fair value $ 1,190.7 $ 900.0 $ 874.9
Fair Value, Measurements, Recurring      
Defined Benefit Plan Disclosure [Line Items]      
Pension assets at fair value 1,190.7 900.0  
Fair Value, Measurements, Recurring | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Pension assets at fair value 588.5 137.1  
Fair Value, Measurements, Recurring | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Pension assets at fair value 271.6 181.9  
Fair Value, Measurements, Recurring | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Pension assets at fair value 45.3 44.8 $ 44.3
Fair Value, Measurements, Recurring | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Pension assets at fair value 518.9 67.0  
Fair Value, Measurements, Recurring | Equities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Pension assets at fair value 518.4 66.6  
Fair Value, Measurements, Recurring | Equities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Pension assets at fair value 0.5 0.4  
Fair Value, Measurements, Recurring | Private Equities      
Defined Benefit Plan Disclosure [Line Items]      
Pension assets at fair value 36.9 36.4  
Fair Value, Measurements, Recurring | Private Equities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Pension assets at fair value 36.9 36.4  
Fair Value, Measurements, Recurring | Corporate and Other      
Defined Benefit Plan Disclosure [Line Items]      
Pension assets at fair value 32.1 29.0  
Fair Value, Measurements, Recurring | Corporate and Other | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Pension assets at fair value 6.0 2.2  
Fair Value, Measurements, Recurring | Corporate and Other | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Pension assets at fair value 17.7 18.4  
Fair Value, Measurements, Recurring | Corporate and Other | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Pension assets at fair value 8.4 8.4  
Fair Value, Measurements, Recurring | Government      
Defined Benefit Plan Disclosure [Line Items]      
Pension assets at fair value 250.5 204.2  
Fair Value, Measurements, Recurring | Government | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Pension assets at fair value 55.4 53.3  
Fair Value, Measurements, Recurring | Government | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Pension assets at fair value 195.1 150.9  
Fair Value, Measurements, Recurring | Interest Bearing      
Defined Benefit Plan Disclosure [Line Items]      
Pension assets at fair value 67.0 27.2  
Fair Value, Measurements, Recurring | Interest Bearing | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Pension assets at fair value 8.7 15.0  
Fair Value, Measurements, Recurring | Interest Bearing | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Pension assets at fair value 58.3 12.2  
Fair Value, Measurements, Recurring | Investments Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Pension assets at fair value $ 285.3 $ 536.2