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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS, Additional Disclosures 2 (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jan. 01, 2018
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets $ 609.7 $ 544.6 $ 550.7  
Target allocation percentage of plan assets by asset category [Abstract]        
Equity securities, range minimum (in hundredths) 53.00% 53.00%    
Equity securities, range maximum (in hundredths) 69.00% 69.00%    
U.S. large cap, range minimum (in hundredths) 22.00% 22.00%    
U.S. large cap, range maximum (in hundredths) 28.00% 28.00%    
U.S. small cap, range minimum (in hundredths) 4.00% 4.00%    
U.S. small cap, range maximum (in hundredths) 10.00% 10.00%    
International all cap, range minimum (in hundredths) 21.00% 21.00%    
International all cap, range maximum (in hundredths) 29.00% 29.00%    
International small cap, range minimum (in hundredths) 2.00% 2.00%    
International small cap, range minimum (in hundredths) 8.00% 8.00%    
Real estate, range minimum (in hundredths) 0.00% 0.00%    
Real estate, range maximum (in hundredths) 13.00% 13.00%    
Fixed income, range minimum (in hundredths) 25.00% 25.00%    
Fixed income, range maximum (in hundredths) 35.00% 35.00%    
Cash and equivalents, range minimum (in hundredths) 0.00% 0.00%    
Cash and equivalents, range maximum (in hundredths) 10.00% 10.00%    
Aggregate fixed income, range minimum (in hundredths) 9.00% 9.00%    
Aggregate fixed income, range maximum (in hundredths) 19.00% 19.00%    
Core plus fixed income, range minimum (in hundredths) 9.00% 9.00%    
Core plus fixed income, range maximum (in hundredths) 19.00% 19.00%    
Expected return on plan assets, fair value of plan assumption $ 2.7      
Estimated future annual payments for pension and other postretirement benefits [Abstract]        
Contributions made to defined contribution plans classified as continuing operations 12.5 $ 16.7 20.0  
Pension benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets $ 609.7 $ 544.6 550.7  
Target allocation percentage of plan assets by asset category [Abstract]        
Expected return on plan assets, weighted average 6.70% 7.15%    
Estimated future employer contributions in next fiscal year $ 25.0      
Estimated future annual payments for pension and other postretirement benefits [Abstract]        
2017 99.4      
2018 46.5      
2019 47.5      
2020 48.0      
2021 48.8      
2022 though 2026 244.1      
Other benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 $ 0.0 $ 0.0  
Target allocation percentage of plan assets by asset category [Abstract]        
Estimated future employer contributions in next fiscal year 2.0      
Estimated future annual payments for pension and other postretirement benefits [Abstract]        
2017 2.5      
2018 1.6      
2019 1.4      
2020 1.3      
2021 1.2      
2022 though 2026 5.7      
U.S. large cap [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 158.2 141.6    
U.S. small cap [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 45.3 41.5    
International all cap [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 156.2 134.4    
International small cap [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 36.3 27.4    
Real estate equities [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 50.6 47.1    
Cash and equivalents [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 6.2 4.6    
Aggregate fixed income [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 74.9 72.4    
Core plus fixed income [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 78.1 73.0    
Group annuity contracts [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 3.9 2.6    
Quoted prices in active markets for identical assets (Level 1) [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 78.1 73.0    
Quoted prices in active markets for identical assets (Level 1) [Member] | U.S. large cap [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.0    
Quoted prices in active markets for identical assets (Level 1) [Member] | U.S. small cap [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.0    
Quoted prices in active markets for identical assets (Level 1) [Member] | International all cap [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.0    
Quoted prices in active markets for identical assets (Level 1) [Member] | International small cap [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.0    
Quoted prices in active markets for identical assets (Level 1) [Member] | Real estate equities [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.0    
Quoted prices in active markets for identical assets (Level 1) [Member] | Cash and equivalents [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.0    
Quoted prices in active markets for identical assets (Level 1) [Member] | Aggregate fixed income [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.0    
Quoted prices in active markets for identical assets (Level 1) [Member] | Core plus fixed income [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 78.1 73.0    
Quoted prices in active markets for identical assets (Level 1) [Member] | Group annuity contracts [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.0    
Significant observable inputs (Level 2) [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 531.6 471.6    
Significant observable inputs (Level 2) [Member] | U.S. large cap [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 158.2 141.6    
Significant observable inputs (Level 2) [Member] | U.S. small cap [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 45.3 41.5    
Significant observable inputs (Level 2) [Member] | International all cap [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 156.2 134.4    
Significant observable inputs (Level 2) [Member] | International small cap [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 36.3 27.4    
Significant observable inputs (Level 2) [Member] | Real estate equities [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 50.6 47.1    
Significant observable inputs (Level 2) [Member] | Cash and equivalents [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 6.2 4.6    
Significant observable inputs (Level 2) [Member] | Aggregate fixed income [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 74.9 72.4    
Significant observable inputs (Level 2) [Member] | Core plus fixed income [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.0    
Significant observable inputs (Level 2) [Member] | Group annuity contracts [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 3.9 2.6    
Significant unobservable inputs (Level 3) [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.0    
Significant unobservable inputs (Level 3) [Member] | U.S. large cap [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.0    
Significant unobservable inputs (Level 3) [Member] | U.S. small cap [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.0    
Significant unobservable inputs (Level 3) [Member] | International all cap [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.0    
Significant unobservable inputs (Level 3) [Member] | International small cap [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.0    
Significant unobservable inputs (Level 3) [Member] | Real estate equities [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.0    
Significant unobservable inputs (Level 3) [Member] | Cash and equivalents [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.0    
Significant unobservable inputs (Level 3) [Member] | Aggregate fixed income [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.0    
Significant unobservable inputs (Level 3) [Member] | Core plus fixed income [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.0    
Significant unobservable inputs (Level 3) [Member] | Group annuity contracts [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets $ 0.0 $ 0.0    
Subsequent Event [Member]        
Target allocation percentage of plan assets by asset category [Abstract]        
Market related valuation losses to be recognized       $ 31.7