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Accumulated Other Comprehensive (Loss) Income - After-Tax Components of and Changes in Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ 2,180.0 $ 2,601.1 $ 2,363.0
Amounts reclassified from accumulated other comprehensive (loss) income into earnings 22.0 1.3  
Ending Balance 2,427.8 2,180.0 2,601.1
ASU 2018-02 [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from accumulated other comprehensive (loss) income into earnings (8.6)    
Foreign Currency Adjustments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (25.3) 5.8 (28.0)
Amounts classified into accumulated other comprehensive (loss) income 13.8 (31.1) 33.8
Other comprehensive (loss) income, net of tax 13.8 (31.1) 33.8
Ending Balance (11.5) (25.3) 5.8
Derivative Hedging Losses (Gains) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 4.2 (2.4) (0.6)
Amounts classified into accumulated other comprehensive (loss) income 5.1 8.3 (1.0)
Amounts reclassified from accumulated other comprehensive (loss) income into earnings (3.8) (1.7) (0.8)
Other comprehensive (loss) income, net of tax 1.3 6.6 (1.8)
Ending Balance 5.5 4.2 (2.4)
Defined benefit plan items [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (45.9) (42.6) (43.3)
Amounts classified into accumulated other comprehensive (loss) income (37.9) (6.3) 4.3
Amounts reclassified from accumulated other comprehensive (loss) income into earnings 25.8 3.0 (3.6)
Other comprehensive (loss) income, net of tax (20.7) (3.3) 0.7
Ending Balance (66.6) (45.9) (42.6)
Defined benefit plan items [Member] | ASU 2018-02 [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Adoption of ASU 2018-02 (8.6)    
Accumulated Other Comprehensive (Loss) Income [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (67.0) (39.2) (71.9)
Amounts classified into accumulated other comprehensive (loss) income (19.0) (29.1) 37.1
Amounts reclassified from accumulated other comprehensive (loss) income into earnings 22.0 1.3 (4.4)
Other comprehensive (loss) income, net of tax (5.6) (27.8) 32.7
Ending Balance (72.6) $ (67.0) $ (39.2)
Accumulated Other Comprehensive (Loss) Income [Member] | ASU 2018-02 [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Adoption of ASU 2018-02 $ (8.6)