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Pension and Other Postretirement Benefit Plans - Pension Plan Assets by Asset Category (Details) - Pension - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value $ 444.2 $ 418.2 $ 376.6
U.S. | Fair value, Measurements, Recurring      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 444.2 418.2  
U.S. | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 381.8 359.9  
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 100.9 104.3  
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 87.1 85.2  
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 95.1 84.2  
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 83.8 66.7  
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 5.2 6.2  
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 1.2 1.4  
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 8.5 11.9  
U.S. | Fair value, Measurements, Recurring | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 233.9 227.7  
U.S. | Fair value, Measurements, Recurring | Level 1 | Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 80.0 85.9  
U.S. | Fair value, Measurements, Recurring | Level 1 | Common stock      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 56.3 53.9  
U.S. | Fair value, Measurements, Recurring | Level 1 | Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 95.1 84.2  
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 0.4 0.9  
U.S. | Fair value, Measurements, Recurring | Level 1 | Cash and short-term investments      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 2.1 2.8  
U.S. | Fair value, Measurements, Recurring | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 147.9 132.2  
U.S. | Fair value, Measurements, Recurring | Level 2 | Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 20.9 18.4  
U.S. | Fair value, Measurements, Recurring | Level 2 | Common stock      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 30.8 31.3  
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 83.8 66.7  
U.S. | Fair value, Measurements, Recurring | Level 2 | Government obligations      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 5.2 6.2  
U.S. | Fair value, Measurements, Recurring | Level 2 | Preferred stock      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.8 0.5  
U.S. | Fair value, Measurements, Recurring | Level 2 | Cash and short-term investments      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 6.4 9.1  
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 62.4 58.3  
Foreign      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 392.5 383.0 $ 396.8
Foreign | Fair value, Measurements, Recurring      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 392.5 383.0  
Foreign | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 363.6 352.7  
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 147.2 138.0  
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 59.5 60.9  
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 63.3 58.4  
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 28.8 30.8  
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 51.8 49.5  
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 13.0 15.1  
Foreign | Fair value, Measurements, Recurring | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 67.4 67.9  
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 59.5 60.9  
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 7.9 7.0  
Foreign | Fair value, Measurements, Recurring | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 296.2 284.8  
Foreign | Fair value, Measurements, Recurring | Level 2 | Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 147.2 138.0  
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 63.3 58.4  
Foreign | Fair value, Measurements, Recurring | Level 2 | Corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 28.8 30.8  
Foreign | Fair value, Measurements, Recurring | Level 2 | Government obligations      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 51.8 49.5  
Foreign | Fair value, Measurements, Recurring | Level 2 | Cash and short-term investments      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 5.1 8.1  
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 $ 28.9 $ 30.3