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Employee Benefit Plans (Details)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
shares
Dec. 31, 2021
USD ($)
plan
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Securities at Net Asset Value   $ 4.0 $ 16.8    
stock acquired during period value employee stock ownership plan $ 34.0   50.0   $ 50.0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of net assets available for plan benefits at beginning of year   462.7      
Fair value of net assets available for plan benefits at end of year   551.9 462.7    
Net pretax amount recognized   (101.9) $ 84.8 $ 6.8  
Estimated future cash contributions next year   $ 0.0      
Employee savings and stock ownership plan, number of allocated shares | shares   18,991,924      
Employee savings and stock ownership plan, number of allocated shares to employees | shares   12,958,437      
Share contractual period   10 years      
Number of shares available for future issuances | shares   4,700,000      
Maximum Number of Common Stock Shares Available Under 2016 Stock Option Plan | shares   15,000,000.0      
Award vesting rate, within one year of grant date   10.00%      
Award vesting rate, between year one and year two   15.00%      
Award vesting rate, between year two and year three   20.00%      
Award vesting rate, between year three and year four   25.00%      
Award vesting rate, between year four and year five   30.00%      
Expected volatility   20.00% 17.00% 18.00%  
Share-based compensation expense   $ 3.2 $ 2.1 $ 3.7  
Income tax benefit   $ 0.6 $ 0.4 $ 0.7  
Expected dividends   4.76% 5.72% 4.10%  
Expected term (in years)   7 years 7 years 7 years  
Risk-free rate   1.21% 0.72% 2.54%  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Options, outstanding at beginning of year | shares   9,494,651 8,009,237 7,163,567  
Granted | shares   2,216,250 1,901,100 1,777,500  
Exercised | shares   3,259,273 397,653 848,923  
Forfeited and canceled | shares   107,158 18,033 82,907  
Options, outstanding at end of year | shares   8,344,470 9,494,651 8,009,237 7,163,567
Exercisable at end of year | shares   4,652,951 6,138,602 5,100,009  
Options, outstanding, weighted average exercise price | $ / shares   $ 19.57 $ 18.36 $ 18.43 $ 17.24
Granted, Weighted Average Exercise Price | $ / shares   21.30 17.24 21.14  
Exercised, Weighted Average Exercise Price | $ / shares   17.28 14.44 14.14  
Forfeited and canceled, Weighted Average Exercise Price | $ / shares   18.32 16.72 17.05  
Exercisable at end of year, Weighted Average Exercise Price | $ / shares   19.22 17.81 17.18  
Weighted average fair value of options granted during the year | $ / shares   $ 1.86 $ 0.88 $ 2.35  
Total unrecognized compensation cost   $ 3.4      
Unrecognized stock compensation costs, weighted average remaining contractual term   3 years      
Cash received from stock option exercise   $ 56.3 $ 5.7 $ 12.0  
Intrinsic value of stock options exercised   24.2 2.8 6.8  
Actual tax benefit realized for tax deductions from stock options exercised   5.0 0.5 1.4  
Employees Savings and Stock Ownership Plan [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Defined contribution plan, cost recognized   44.6 30.6 21.7  
Other profit sharing plans [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Defined contribution plan, cost recognized   26.1 24.0 18.4  
Cash and deferred incentive compensation [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Defined contribution plan, cost recognized   71.6 53.7 48.3  
Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of net assets available for plan benefits at beginning of year   409.1      
Fair value of net assets available for plan benefits at end of year   491.3 409.1    
Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of net assets available for plan benefits at beginning of year   49.0      
Fair value of net assets available for plan benefits at end of year   57.9 49.0    
Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of net assets available for plan benefits at beginning of year   4.5      
Fair value of net assets available for plan benefits at end of year   $ 2.6 4.5    
Pension Plans, Defined Benefit [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Number of benefit plans | plan   1      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]          
Projected benefit obligation at beginning of year   $ 639.7 586.4 530.1  
Interest cost   15.2 19.1 22.6  
Actuarial (gains) losses   (22.2) 60.8 59.8  
Benefits paid   (28.0) (26.6) (26.0)  
Net increase (decrease) for the year   (35.1) 53.3 56.3  
Projected benefit obligation at end of year   604.6 639.7 586.4 $ 530.1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of net assets available for plan benefits at beginning of year   479.6 492.8 430.2  
Actual return on plan assets   104.4 6.8 82.1  
Sponsor contributions   0.0 6.6 6.5  
Benefits paid   (28.0) (26.6) (26.0)  
Net increase (decrease) for year   76.3 (13.1) 62.5  
Fair value of net assets available for plan benefits at end of year   556.0 479.6 492.8 $ 430.2
Defined Benefit Plan, Funded (Unfunded) Status of Plan   (48.6) (160.1) (93.6)  
Net cost   (9.8) (11.0) (3.0)  
Net recognized loss   $ (123.2) $ (224.8) $ (140.5)  
Settlement discount rates - Projected Benefit Obligation   2.80% 2.45%    
Settlement discount rates - Net Periodic Benefit Costs   2.45% 3.35% 4.40%  
Long-term rates of return on plans' assets   7.00% 7.00% 7.00%  
Expected future benefit payments in year one   $ 31.9      
Expected future benefit payments in year two   32.8      
Expected future benefit payments in year three   33.4      
Expected future benefit payments in year four   33.8      
Expected future benefit payments in year five   34.4      
Expected future benefit payments in five fiscal years thereafter   $ 170.5      
Total investments   100.00% 100.00%    
Pension Plans, Defined Benefit [Member] | Common shares of Company stock [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of net assets available for plan benefits at beginning of year   $ 55.7      
Fair value of net assets available for plan benefits at end of year   $ 69.5 $ 55.7    
Total investments   12.50% 11.70%    
Pension Plans, Defined Benefit [Member] | Common shares of Company stock [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of net assets available for plan benefits at beginning of year   $ 55.7      
Fair value of net assets available for plan benefits at end of year   69.5 $ 55.7    
Pension Plans, Defined Benefit [Member] | Common shares of Company stock [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of net assets available for plan benefits at beginning of year   0.0      
Fair value of net assets available for plan benefits at end of year   0.0 0.0    
Pension Plans, Defined Benefit [Member] | Common shares of Company stock [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of net assets available for plan benefits at beginning of year   0.0      
Fair value of net assets available for plan benefits at end of year   0.0 0.0    
Pension Plans, Defined Benefit [Member] | Equity securities, other [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of net assets available for plan benefits at beginning of year   341.7      
Fair value of net assets available for plan benefits at end of year   $ 414.5 $ 341.7    
Total investments   74.60% 74.00%    
Pension Plans, Defined Benefit [Member] | Equity securities, other [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of net assets available for plan benefits at beginning of year   $ 341.7      
Fair value of net assets available for plan benefits at end of year   414.5 $ 341.7    
Pension Plans, Defined Benefit [Member] | Equity securities, other [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of net assets available for plan benefits at beginning of year   0.0      
Fair value of net assets available for plan benefits at end of year   0.0 0.0    
Pension Plans, Defined Benefit [Member] | Equity securities, other [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of net assets available for plan benefits at beginning of year   0.0      
Fair value of net assets available for plan benefits at end of year   0.0 0.0    
Pension Plans, Defined Benefit [Member] | Equity Securities [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of net assets available for plan benefits at beginning of year   397.4      
Fair value of net assets available for plan benefits at end of year   $ 484.1 $ 397.4    
Total investments   87.10% 85.70%    
Pension Plans, Defined Benefit [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of net assets available for plan benefits at beginning of year   $ 397.4      
Fair value of net assets available for plan benefits at end of year   484.1 $ 397.4    
Pension Plans, Defined Benefit [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of net assets available for plan benefits at beginning of year   0.0      
Fair value of net assets available for plan benefits at end of year   0.0 0.0    
Pension Plans, Defined Benefit [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of net assets available for plan benefits at beginning of year   0.0      
Fair value of net assets available for plan benefits at end of year   0.0 0.0    
Pension Plans, Defined Benefit [Member] | Fixed maturity securities [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of net assets available for plan benefits at beginning of year   51.0      
Fair value of net assets available for plan benefits at end of year   $ 57.9 $ 51.0    
Total investments   10.40% 10.60%    
Pension Plans, Defined Benefit [Member] | Fixed maturity securities [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of net assets available for plan benefits at beginning of year   $ 2.0      
Fair value of net assets available for plan benefits at end of year   0.0 $ 2.0    
Pension Plans, Defined Benefit [Member] | Fixed maturity securities [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of net assets available for plan benefits at beginning of year   49.0      
Fair value of net assets available for plan benefits at end of year   57.9 49.0    
Pension Plans, Defined Benefit [Member] | Fixed maturity securities [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of net assets available for plan benefits at beginning of year   0.0      
Fair value of net assets available for plan benefits at end of year   0.0 0.0    
Pension Plans, Defined Benefit [Member] | Benefit plan assets, Other [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of net assets available for plan benefits at beginning of year   14.2      
Fair value of net assets available for plan benefits at end of year   $ 9.9 $ 14.2    
Total investments   2.50% 3.70%    
Pension Plans, Defined Benefit [Member] | Benefit plan assets, Other [Member] | Fair Value, Inputs, Level 1 [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of net assets available for plan benefits at beginning of year   $ 9.6      
Fair value of net assets available for plan benefits at end of year   7.2 $ 9.6    
Pension Plans, Defined Benefit [Member] | Benefit plan assets, Other [Member] | Fair Value, Inputs, Level 2 [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of net assets available for plan benefits at beginning of year   0.0      
Fair value of net assets available for plan benefits at end of year   0.0 0.0    
Pension Plans, Defined Benefit [Member] | Benefit plan assets, Other [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of net assets available for plan benefits at beginning of year   4.5      
Fair value of net assets available for plan benefits at end of year   $ 2.6 $ 4.5    
Minimum [Member] | Pension Plans, Defined Benefit [Member] | Equity Securities [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Investment Policy Asset Allocation % Range Target   40.00%      
Minimum [Member] | Pension Plans, Defined Benefit [Member] | Fixed maturity securities [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Investment Policy Asset Allocation % Range Target   15.00%      
Minimum [Member] | Pension Plans, Defined Benefit [Member] | Benefit plan assets, Other [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Investment Policy Asset Allocation % Range Target   1.00%      
Maximum [Member] | Pension Plans, Defined Benefit [Member] | Equity Securities [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Investment Policy Asset Allocation % Range Target   80.00%      
Maximum [Member] | Pension Plans, Defined Benefit [Member] | Fixed maturity securities [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Investment Policy Asset Allocation % Range Target   60.00%      
Maximum [Member] | Pension Plans, Defined Benefit [Member] | Benefit plan assets, Other [Member]          
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Investment Policy Asset Allocation % Range Target   10.00%      
Common Stock [Member]          
Defined Benefit Plan Disclosure [Line Items]          
stock acquired during period shares employee stock ownership plan | shares 2,200,000   3,337,000   2,383,625
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Restricted common stock vesting period   3 years      
Range of Exercise Prices, $10.80 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Options, outstanding at end of year | shares   26,925      
Exercisable at end of year | shares   26,925      
Options, outstanding, weighted average exercise price | $ / shares   $ 10.80      
Exercisable at end of year, Weighted Average Exercise Price | $ / shares   $ 10.80      
Options, Outstanding, Weighted Average Remaining Contractual Life   3 months      
Range of Exercise Prices, $12.57[Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Options, outstanding at end of year | shares   133,225      
Exercisable at end of year | shares   133,225      
Options, outstanding, weighted average exercise price | $ / shares   $ 12.57      
Exercisable at end of year, Weighted Average Exercise Price | $ / shares   $ 12.57      
Options, Outstanding, Weighted Average Remaining Contractual Life   1 year 3 months      
Range of Exercise Prices, $16.06 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Options, outstanding at end of year | shares   256,700      
Exercisable at end of year | shares   256,700      
Options, outstanding, weighted average exercise price | $ / shares   $ 16.06      
Exercisable at end of year, Weighted Average Exercise Price | $ / shares   $ 16.06      
Options, Outstanding, Weighted Average Remaining Contractual Life   2 years 3 months      
Range of Exercise Prices, $15.26 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Options, outstanding at end of year | shares   310,157      
Exercisable at end of year | shares   310,157      
Options, outstanding, weighted average exercise price | $ / shares   $ 15.26      
Exercisable at end of year, Weighted Average Exercise Price | $ / shares   $ 15.26      
Options, Outstanding, Weighted Average Remaining Contractual Life   3 years 3 months      
Range of Exercise Prices, $18.14 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Options, outstanding at end of year | shares   498,291      
Exercisable at end of year | shares   498,291      
Options, outstanding, weighted average exercise price | $ / shares   $ 18.14      
Exercisable at end of year, Weighted Average Exercise Price | $ / shares   $ 18.14      
Options, Outstanding, Weighted Average Remaining Contractual Life   4 years 3 months      
Range of Exercise Prices, $19.98 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Options, outstanding at end of year | shares   867,958      
Exercisable at end of year | shares   867,958      
Options, outstanding, weighted average exercise price | $ / shares   $ 19.98      
Exercisable at end of year, Weighted Average Exercise Price | $ / shares   $ 19.98      
Options, Outstanding, Weighted Average Remaining Contractual Life   5 years 3 months      
Range of Exercise Prices, $20.98 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Options, outstanding at end of year | shares   1,133,162      
Exercisable at end of year | shares   830,420      
Options, outstanding, weighted average exercise price | $ / shares   $ 20.98      
Exercisable at end of year, Weighted Average Exercise Price | $ / shares   $ 20.98      
Options, Outstanding, Weighted Average Remaining Contractual Life   6 years 3 months      
Range of Exercise Prices, $21.12 to $21.99 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Options, outstanding at end of year | shares   1,486,282      
Exercisable at end of year | shares   820,072      
Options, outstanding, weighted average exercise price | $ / shares   $ 21.14      
Exercisable at end of year, Weighted Average Exercise Price | $ / shares   $ 21.14      
Options, Outstanding, Weighted Average Remaining Contractual Life   7 years 3 months      
Range of Exercise Prices, $16.17 to $22.72 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Options, outstanding at end of year | shares   1,587,670      
Exercisable at end of year | shares   487,334      
Options, outstanding, weighted average exercise price | $ / shares   $ 17.21      
Exercisable at end of year, Weighted Average Exercise Price | $ / shares   $ 17.44      
Options, Outstanding, Weighted Average Remaining Contractual Life   8 years 3 months      
Range of Exercise Prices, $21.30 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Options, outstanding at end of year | shares   2,044,100      
Exercisable at end of year | shares   421,869      
Options, outstanding, weighted average exercise price | $ / shares   $ 21.30      
Exercisable at end of year, Weighted Average Exercise Price | $ / shares   $ 21.30      
Options, Outstanding, Weighted Average Remaining Contractual Life   9 years 3 months