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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]        
Net income $ 88.4 $ 78.3 $ 168.6 $ 253.9
Available-for-sale securities:        
Net (depreciation) appreciation during the period (3.6) (31.2) 164.2 (94.7)
Change in other-than-temporary impairment losses recognized in other comprehensive income 1.6 (3.9) 7.3 (8.3)
Total available-for-sale securities (2.0) (35.1) 171.5 (103.0)
Pension and postretirement benefits:        
Net actuarial losses and prior service costs arising in the period       (1.4)
Amortization recognized as net periodic benefit and postretirement cost 1.5 1.7 4.8 6.8
Total pension and postretirement benefits 1.5 1.7 4.8 5.4
Cumulative foreign currency translation adjustment:        
Amount recognized as cumulative foreign currency translation during the period (1.9) (2.6) (3.2) (4.8)
Total other comprehensive (loss) income, net of tax (2.4) (36.0) 173.1 (102.4)
Comprehensive income $ 86.0 $ 42.3 $ 341.7 $ 151.5