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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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ 2,463.1 $ 2,344.7 $ 2,427.8 $ 2,180.0
Amounts classified into accumulated other comprehensive (loss) income 17.4 (12.7) (21.4) 1.3
Amounts reclassified from accumulated other comprehensive (loss) income 1.4 1.3 2.5 (1.2)
Other comprehensive (loss) income, net of tax 18.8 (11.4) (18.9) (8.5)
Ending Balance 2,628.6 2,336.7 2,628.6 2,336.7
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 (41.8) (11.6) (11.5) (25.3)
Amounts classified into accumulated other comprehensive (loss) income 17.6 (12.6) (12.7) 1.1
Other comprehensive (loss) income, net of tax 17.6 (12.6) (12.7) 1.1
Ending Balance (24.2) (24.2) (24.2) (24.2)
Derivative Hedging Gain (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (1.1) 2.0 5.5 4.2
Amounts classified into accumulated other comprehensive (loss) income   2.7 (7.7) 3.0
Amounts reclassified from accumulated other comprehensive (loss) income 1.0 (0.3) 2.1 (2.8)
Other comprehensive (loss) income, net of tax 1.0 2.4 (5.6) 0.2
Ending Balance (0.1) 4.4 (0.1) 4.4
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 (0.2) (2.8) (1.0) (2.8)
Amounts reclassified from accumulated other comprehensive (loss) income 0.4 1.6 0.4 1.6
Other comprehensive (loss) income, net of tax 0.2 (1.2) (0.6) (9.8)
Ending Balance (67.2) (55.7) (67.2) (55.7)
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 (110.3) (64.1) (72.6) (67.0)
Ending Balance $ (91.5) $ (75.5) $ (91.5) $ (75.5)