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Pension and Other Postretirement Benefit Plans - Pension Plan Assets by Asset Category (Details) - Pension - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value $ 418.2 $ 376.6 $ 330.6
U.S. | Fair value, Measurements, Recurring      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 418.2 376.6  
U.S. | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 359.9 333.4  
U.S. | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 104.3 103.6  
U.S. | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Common stock      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 85.2 77.4  
U.S. | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 84.2 76.0  
U.S. | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 66.7 53.9  
U.S. | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Government obligations      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 6.2 7.3  
U.S. | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Preferred stock      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 1.4 1.2  
U.S. | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Cash and short-term investments      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 11.9 14.0  
U.S. | Fair value, Measurements, Recurring | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 227.7 212.0  
U.S. | Fair value, Measurements, Recurring | Level 1 | Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 85.9 81.5  
U.S. | Fair value, Measurements, Recurring | Level 1 | Common stock      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 53.9 45.5  
U.S. | Fair value, Measurements, Recurring | Level 1 | Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 84.2 76.0  
U.S. | Fair value, Measurements, Recurring | Level 1 | Corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.0 0.0  
U.S. | Fair value, Measurements, Recurring | Level 1 | Government obligations      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.0 0.0  
U.S. | Fair value, Measurements, Recurring | Level 1 | Preferred stock      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.9 0.6  
U.S. | Fair value, Measurements, Recurring | Level 1 | Cash and short-term investments      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 2.8 8.4  
U.S. | Fair value, Measurements, Recurring | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 132.2 121.4  
U.S. | Fair value, Measurements, Recurring | Level 2 | Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 18.4 22.1  
U.S. | Fair value, Measurements, Recurring | Level 2 | Common stock      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 31.3 31.9  
U.S. | Fair value, Measurements, Recurring | Level 2 | Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.0 0.0  
U.S. | Fair value, Measurements, Recurring | Level 2 | Corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 66.7 53.9  
U.S. | Fair value, Measurements, Recurring | Level 2 | Government obligations      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 6.2 7.3  
U.S. | Fair value, Measurements, Recurring | Level 2 | Preferred stock      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.5 0.6  
U.S. | Fair value, Measurements, Recurring | Level 2 | Cash and short-term investments      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 9.1 5.6  
U.S. | Fair value, Measurements, Recurring | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.0 0.0  
U.S. | Fair value, Measurements, Recurring | Level 3 | Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.0 0.0  
U.S. | Fair value, Measurements, Recurring | Level 3 | Common stock      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.0 0.0  
U.S. | Fair value, Measurements, Recurring | Level 3 | Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.0 0.0  
U.S. | Fair value, Measurements, Recurring | Level 3 | Corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.0 0.0  
U.S. | Fair value, Measurements, Recurring | Level 3 | Government obligations      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.0 0.0  
U.S. | Fair value, Measurements, Recurring | Level 3 | Preferred stock      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.0 0.0  
U.S. | Fair value, Measurements, Recurring | Level 3 | Cash and short-term investments      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.0 0.0  
U.S. | Fair value, Measurements, Recurring | Alternative investments      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 58.3 43.2  
Foreign      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 383.0 396.8 $ 351.8
Foreign | Fair value, Measurements, Recurring      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 383.0 396.8  
Foreign | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 352.7 358.9  
Foreign | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 138.0 148.4  
Foreign | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Common stock      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 60.9 66.7  
Foreign | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 58.4 45.6  
Foreign | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 30.8 31.5  
Foreign | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Government obligations      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 49.5 55.8  
Foreign | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Cash and short-term investments      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 15.1 10.9  
Foreign | Fair value, Measurements, Recurring | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 67.9 74.4  
Foreign | Fair value, Measurements, Recurring | Level 1 | Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.0 0.0  
Foreign | Fair value, Measurements, Recurring | Level 1 | Common stock      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 60.9 66.7  
Foreign | Fair value, Measurements, Recurring | Level 1 | Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.0 0.0  
Foreign | Fair value, Measurements, Recurring | Level 1 | Corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.0 0.0  
Foreign | Fair value, Measurements, Recurring | Level 1 | Government obligations      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.0 0.0  
Foreign | Fair value, Measurements, Recurring | Level 1 | Cash and short-term investments      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 7.0 7.7  
Foreign | Fair value, Measurements, Recurring | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 284.8 284.5  
Foreign | Fair value, Measurements, Recurring | Level 2 | Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 138.0 148.4  
Foreign | Fair value, Measurements, Recurring | Level 2 | Common stock      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.0 0.0  
Foreign | Fair value, Measurements, Recurring | Level 2 | Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 58.4 45.6  
Foreign | Fair value, Measurements, Recurring | Level 2 | Corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 30.8 31.5  
Foreign | Fair value, Measurements, Recurring | Level 2 | Government obligations      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 49.5 55.8  
Foreign | Fair value, Measurements, Recurring | Level 2 | Cash and short-term investments      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 8.1 3.2  
Foreign | Fair value, Measurements, Recurring | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.0 0.0  
Foreign | Fair value, Measurements, Recurring | Level 3 | Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.0 0.0  
Foreign | Fair value, Measurements, Recurring | Level 3 | Common stock      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.0 0.0  
Foreign | Fair value, Measurements, Recurring | Level 3 | Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.0 0.0  
Foreign | Fair value, Measurements, Recurring | Level 3 | Corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.0 0.0  
Foreign | Fair value, Measurements, Recurring | Level 3 | Government obligations      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.0 0.0  
Foreign | Fair value, Measurements, Recurring | Level 3 | Cash and short-term investments      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.0 0.0  
Foreign | Fair value, Measurements, Recurring | Alternative investments      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value $ 30.3 $ 37.9