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Pension and Other Postretirement Benefit Plans - Pension Plan Assets by Asset Category (Detail) - Pension - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value $ 376.6 $ 330.6 $ 438.2
U.S. | Fair value, measurements, recurring      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 376.6 330.6  
Assets at fair value, excluding alternative investments 333.4 283.1  
U.S. | Fair value, measurements, recurring | Mutual funds/Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 103.6 89.1  
U.S. | Fair value, measurements, recurring | Common stock      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 77.4 61.2  
U.S. | Fair value, measurements, recurring | Mutual funds/Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 76.0 78.6  
U.S. | Fair value, measurements, recurring | Corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 53.9 47.7  
U.S. | Fair value, measurements, recurring | Government obligations      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 7.3 1.0  
U.S. | Fair value, measurements, recurring | Preferred stock      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 1.2 1.3  
U.S. | Fair value, measurements, recurring | Cash and short-term investments      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 14.0 4.2  
U.S. | Fair value, measurements, recurring | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 212.0 187.6  
U.S. | Fair value, measurements, recurring | Level 1 | Mutual funds/Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 81.5 74.4  
U.S. | Fair value, measurements, recurring | Level 1 | Common stock      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 45.5 33.6  
U.S. | Fair value, measurements, recurring | Level 1 | Mutual funds/Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 76.0 78.6  
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 0.6 0.8  
U.S. | Fair value, measurements, recurring | Level 1 | Cash and short-term investments      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 8.4 0.2  
U.S. | Fair value, measurements, recurring | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 121.4 95.5  
U.S. | Fair value, measurements, recurring | Level 2 | Mutual funds/Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 22.1 14.7  
U.S. | Fair value, measurements, recurring | Level 2 | Common stock      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 31.9 27.6  
U.S. | Fair value, measurements, recurring | Level 2 | Mutual funds/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 53.9 47.7  
U.S. | Fair value, measurements, recurring | Level 2 | Government obligations      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 7.3 1.0  
U.S. | Fair value, measurements, recurring | Level 2 | Preferred stock      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0.6 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 5.6 4.0  
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 | Mutual funds/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 | Mutual funds/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 43.2 47.5  
Foreign      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 396.8 351.8 $ 406.4
Foreign | Fair value, measurements, recurring      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 396.8 351.8  
Assets at fair value, excluding alternative investments 358.9 317.7  
Foreign | Fair value, measurements, recurring | Mutual funds/Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 148.4 138.1  
Foreign | Fair value, measurements, recurring | Common stock      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 66.7 58.3  
Foreign | Fair value, measurements, recurring | Mutual funds/Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 45.6 28.2  
Foreign | Fair value, measurements, recurring | Corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 31.5 32.9  
Foreign | Fair value, measurements, recurring | Government obligations      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 55.8 52.8  
Foreign | Fair value, measurements, recurring | Cash and short-term investments      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 10.9 7.4  
Foreign | Fair value, measurements, recurring | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 74.4 62.3  
Foreign | Fair value, measurements, recurring | Level 1 | Mutual funds/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 66.7 58.3  
Foreign | Fair value, measurements, recurring | Level 1 | Mutual funds/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 7.7 4.0  
Foreign | Fair value, measurements, recurring | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 284.5 255.4  
Foreign | Fair value, measurements, recurring | Level 2 | Mutual funds/Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 148.4 138.1  
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 | Mutual funds/Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 45.6 28.2  
Foreign | Fair value, measurements, recurring | Level 2 | Corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 31.5 32.9  
Foreign | Fair value, measurements, recurring | Level 2 | Government obligations      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 55.8 52.8  
Foreign | Fair value, measurements, recurring | Level 2 | Cash and short-term investments      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 3.2 3.4  
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 | Mutual funds/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 | Mutual funds/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 $ 37.9 $ 34.1