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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ 2,344.7 $ 2,174.7 $ 2,180.0 $ 2,601.1
Ending Balance 2,336.7 2,233.6 2,336.7 2,233.6
Foreign Currency Adjustments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (11.6) (11.3) (25.3) 5.8
Amounts classified into accumulated other comprehensive (loss) income (12.6) 7.6 1.1 (9.5)
Other comprehensive (loss) income, net of tax (12.6) 7.6 1.1 (9.5)
Ending Balance (24.2) (3.7) (24.2) (3.7)
Derivative Hedging Gain (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 2.0 0.5 4.2 (2.4)
Amounts classified into accumulated other comprehensive (loss) income 2.7 3.3 3.0 6.2
Amounts reclassified from accumulated other comprehensive (loss) income (0.3) (0.4) (2.8) (0.4)
Other comprehensive (loss) income, net of tax 2.4 2.9 0.2 5.8
Ending Balance 4.4 3.4 4.4 3.4
Defined Benefit Plan Adjustments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance [1] (54.5) (42.4) (45.9) (42.6)
Amounts classified into accumulated other comprehensive (loss) income [1] (2.8) (3.2) (2.8) (3.0)
Adoption of ASU 2018-02 [1],[2] (8.6)   (8.6)  
Amounts reclassified from accumulated other comprehensive (loss) income [1] 1.6 0.2 1.6 0.2
Other comprehensive (loss) income, net of tax [1] (1.2) (3.0) (9.8) (2.8)
Ending Balance [1] (55.7) (45.4) (55.7) (45.4)
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (64.1) (53.2) (67.0) (39.2)
Amounts classified into accumulated other comprehensive (loss) income (12.7) 7.7 1.3 (6.3)
Adoption of ASU 2018-02 [2] (8.6)   (8.6)  
Amounts reclassified from accumulated other comprehensive (loss) income 1.3 (0.2) (1.2) (0.2)
Other comprehensive (loss) income, net of tax (11.4) 7.5 (8.5) (6.5)
Ending Balance $ (75.5) $ (45.7) $ (75.5) $ (45.7)
[1] See Note 12, “Defined Benefit Plans,” for further information on the adjustments related to defined benefit plans.
[2] See Note 2, “Recently Issued Accounting Standards,” for further information on the impact of adopting ASU 2018-02.