XML 100 R85.htm IDEA: XBRL DOCUMENT v3.20.4
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, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ 2,427.8 $ 2,180.0 $ 2,601.1
Amounts classified into accumulated other comprehensive (loss) income 12.3 (19.0) (29.1)
Amounts reclassified into earnings 5.2 22.0 1.3
Other comprehensive (loss) income, net of tax 17.5 (5.6) (27.8)
Ending Balance 2,775.5 2,427.8 2,180.0
Revision of Prior Period, Accounting Standards Update, Adjustment [Member] | ASU 2018-02 [Member]      
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 (11.5) (25.3) 5.8
Amounts classified into accumulated other comprehensive (loss) income 18.7 13.8 (31.1)
Other comprehensive (loss) income, net of tax 18.7 13.8 (31.1)
Ending Balance 7.2 (11.5) (25.3)
Derivative Hedging Gain (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 5.5 4.2 (2.4)
Amounts classified into accumulated other comprehensive (loss) income (3.7) 5.1 8.3
Amounts reclassified into earnings 2.4 (3.8) (1.7)
Other comprehensive (loss) income, net of tax (1.3) 1.3 6.6
Ending Balance 4.2 5.5 4.2
Defined Benefit Plan Adjustments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (66.6) (45.9) (42.6)
Amounts classified into accumulated other comprehensive (loss) income (2.7) (37.9) (6.3)
Amounts reclassified into earnings 2.8 25.8 3.0
Other comprehensive (loss) income, net of tax 0.1 (20.7) (3.3)
Ending Balance (66.5) (66.6) (45.9)
Defined Benefit Plan Adjustments [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [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 (72.6) (67.0) (39.2)
Ending Balance $ (55.1) $ (72.6) $ (67.0)