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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
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ 2,357.9 $ 2,247.1 $ 2,427.8 $ 2,180.0
Amounts classified into accumulated other comprehensive (loss) income 11.4 4.6 (38.8) 14.0
Amounts reclassified from accumulated other comprehensive (loss) income 1.5 (1.4) 1.1 (2.5)
Other comprehensive (loss) income, net of tax 12.9 3.2 (37.7) 2.9
Ending Balance 2,463.1 2,344.7 2,463.1 2,344.7
Revision of Prior Period, Accounting Standards Update, Adjustment [Member] | ASU 2018-02        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Adoption of ASU 2018-02       (8.6)
Foreign Currency Adjustments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (53.2) (16.5) (11.5) (25.3)
Amounts classified into accumulated other comprehensive (loss) income 11.4 4.9 (30.3) 13.7
Other comprehensive (loss) income, net of tax 11.4 4.9 (30.3) 13.7
Ending Balance (41.8) (11.6) (41.8) (11.6)
Derivative Hedging Gain (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (2.6) 3.7 5.5 4.2
Amounts classified into accumulated other comprehensive (loss) income   (0.3) (7.7) 0.3
Amounts reclassified from accumulated other comprehensive (loss) income 1.5 (1.4) 1.1 (2.5)
Other comprehensive (loss) income, net of tax 1.5 (1.7) (6.6) (2.2)
Ending Balance (1.1) 2.0 (1.1) 2.0
Defined Benefit Plan Adjustments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (67.4) (54.5) (66.6) (45.9)
Amounts classified into accumulated other comprehensive (loss) income     (0.8)  
Other comprehensive (loss) income, net of tax     (0.8) (8.6)
Ending Balance (67.4) (54.5) (67.4) (54.5)
Defined Benefit Plan Adjustments [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member] | ASU 2018-02        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Adoption of ASU 2018-02       (8.6)
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (123.2) (67.3) (72.6) (67.0)
Ending Balance $ (110.3) $ (64.1) $ (110.3) $ (64.1)