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Accumulated Other Comprehensive (Loss) Income - Changes in Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Jan. 01, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning Balance     $ 1,746.7 [1] $ 1,819.7 $ 1,819.7  
Other comprehensive (loss) income before reclassifications     76.1 (58.2)    
Amounts reclassified from accumulated other comprehensive income     6.7 0.3    
Net current-period other comprehensive (loss) income     82.8 (57.9)    
Ending Balance $ 1,893.4 $ 1,818.1 1,893.4 1,818.1 1,746.7 [1]  
Foreign Currency Translation Adjustments [Member]            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning Balance     (22.4) (19.0) (19.0)  
Other comprehensive (loss) income before reclassifications     (0.1) (4.8)    
Amounts reclassified from accumulated other comprehensive income     0.0 0.0    
Net current-period other comprehensive (loss) income     (0.1) (4.8)    
Ending Balance (22.5) (23.8) (22.5) (23.8) (22.4)  
Foreign Currency Translation Adjustments [Member] | ASU 2016-01 [Member]            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Cumulative effect of adoption of ASU           $ 0.0
Foreign Currency Translation Adjustments [Member] | ASU 2018-02 [Member]            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Cumulative effect of adoption of ASU           0.0
Unrealized Holding Gains on Securities [Member]            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning Balance     (49.0) 121.9 121.9  
Other comprehensive (loss) income before reclassifications     76.2 (53.4)    
Amounts reclassified from accumulated other comprehensive income 2.5 (2.1) 6.7 0.3 0.3  
Net current-period other comprehensive (loss) income     82.9 (53.1)    
Ending Balance 33.9 (26.6) 33.9 (26.6) (49.0)  
Unrealized Holding Gains on Securities [Member] | ASU 2016-01 [Member]            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Cumulative effect of adoption of ASU           (117.5)
Unrealized Holding Gains on Securities [Member] | ASU 2018-02 [Member]            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Cumulative effect of adoption of ASU           22.1
Defined Benefit Pension Plans [Member]            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning Balance     (6.7) (6.3) (6.3)  
Other comprehensive (loss) income before reclassifications     0.0 0.0    
Amounts reclassified from accumulated other comprehensive income     0.0 0.0    
Net current-period other comprehensive (loss) income     0.0 0.0    
Ending Balance (6.7) (7.7) (6.7) (7.7) (6.7)  
Defined Benefit Pension Plans [Member] | ASU 2016-01 [Member]            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Cumulative effect of adoption of ASU           0.0
Defined Benefit Pension Plans [Member] | ASU 2018-02 [Member]            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Cumulative effect of adoption of ASU           (1.4)
Accumulated Other Comprehensive Income (Loss) Member]            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning Balance     (78.1) 96.6 96.6  
Ending Balance $ 4.7 $ (58.1) $ 4.7 $ (58.1) $ (78.1)  
Accumulated Other Comprehensive Income (Loss) Member] | ASU 2016-01 [Member]            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Cumulative effect of adoption of ASU           (117.5)
Accumulated Other Comprehensive Income (Loss) Member] | ASU 2018-02 [Member]            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Cumulative effect of adoption of ASU           $ 20.7
[1] Derived from audited consolidated financial statements.