XML 120 R140.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Pension and Savings Plans Fair Value of Assets in the Master Trust by Asset (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Apr. 01, 2017
Dec. 31, 2016
Corporate bonds          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period $ 598.3 $ 466.1      
U.S. government securities          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 154.9 198.9      
International government securities          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 18.2 12.4      
Mortgage Backed Securities, Other          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 3.4        
Commercial Paper          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period   2.1      
Cash funds          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 33.2 38.4      
Real estate interests          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 4.1 6.2      
Private mutual funds          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 43.1 40.7      
Level 1          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 169.1 219.9      
Level 1 | Corporate bonds          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 0.0 0.0      
Level 1 | U.S. government securities          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 135.9 181.5      
Level 1 | International government securities          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 0.0 0.0      
Level 1 | Mortgage Backed Securities, Other          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 0.0        
Level 1 | Commercial Paper          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period   0.0      
Level 1 | Cash funds          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 33.2 38.4      
Level 1 | Real estate interests          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 0.0 0.0      
Level 2          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 638.9 498.0      
Level 2 | Corporate bonds          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 598.3 466.1      
Level 2 | U.S. government securities          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 19.0 17.4      
Level 2 | International government securities          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 18.2 12.4      
Level 2 | Mortgage Backed Securities, Other          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 3.4        
Level 2 | Commercial Paper          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period   2.1      
Level 2 | Cash funds          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 0.0 0.0      
Level 2 | Real estate interests          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 0.0 0.0      
Level 3          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 4.1 6.2 $ 11.8 $ 13.8 $ 14.1
Level 3 | Corporate bonds          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 0.0 0.0      
Level 3 | U.S. government securities          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 0.0 0.0      
Level 3 | International government securities          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 0.0 0.0      
Level 3 | Mortgage Backed Securities, Other          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 0.0        
Level 3 | Commercial Paper          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period   0.0      
Level 3 | Cash funds          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 0.0 0.0      
Level 3 | Real estate interests          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 4.1 6.2      
Pension Plans, Defined Benefit          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period 855.2 764.8 $ 776.6    
Fair Value Pension Plan Assets          
Defined Benefit Plan Disclosure [Line Items]          
Fair value of plan assets at end of period $ 812.1 $ 724.1