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Accumulated Other Comprehensive (Loss) Income - Changes in Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Jan. 01, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance $ 1,781.1 [1] $ 1,746.7  
Other comprehensive loss before reclassifications (105.1) 47.9  
Amounts reclassified from accumulated other comprehensive loss (5.3) 2.6  
Net current-period other comprehensive loss (110.4) 50.5  
Ending Balance 1,636.8 1,880.6  
ASU 2016-13 [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cumulative effect of adoption of ASU 2016-13, net of taxes     $ (2.2)
Foreign Currency Translation Adjustments [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (22.6) (22.4)  
Other comprehensive loss before reclassifications (3.4) 0.2  
Amounts reclassified from accumulated other comprehensive loss 0.0 0.0  
Net current-period other comprehensive loss (3.4) 0.2  
Ending Balance (26.0) (22.2)  
Foreign Currency Translation Adjustments [Member] | ASU 2016-13 [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cumulative effect of adoption of ASU 2016-13, net of taxes     0.0
Unrealized Holding Gains on Securities [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance 33.5 (49.0)  
Other comprehensive loss before reclassifications (101.7) 47.7  
Amounts reclassified from accumulated other comprehensive loss (5.3) 2.6  
Net current-period other comprehensive loss (107.0) 50.3  
Ending Balance (67.8) 1.3  
Unrealized Holding Gains on Securities [Member] | ASU 2016-13 [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cumulative effect of adoption of ASU 2016-13, net of taxes     5.7
Defined Benefit Pension Plans [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (8.1) (6.7)  
Other comprehensive loss before reclassifications 0.0 0.0  
Amounts reclassified from accumulated other comprehensive loss 0.0 0.0  
Net current-period other comprehensive loss 0.0 0.0  
Ending Balance (8.1) (6.7)  
Defined Benefit Pension Plans [Member] | ASU 2016-13 [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cumulative effect of adoption of ASU 2016-13, net of taxes     0.0
Accumulated Other Comprehensive Income (Loss) Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance 2.8 (78.1)  
Ending Balance $ (101.9) $ (27.6)  
Accumulated Other Comprehensive Income (Loss) Member] | ASU 2016-13 [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Cumulative effect of adoption of ASU 2016-13, net of taxes     $ 5.7
[1] Derived from audited consolidated financial statements.