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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Share-Based Compensation - Weighted average assumptions used in valuing options (Details) - USD ($)		1 Months Ended	12 Months Ended			90 Months Ended
	Jun. 07, 2020	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2009	Oct. 29, 2020
Employee Stock Purchase Plan
Additional disclosures
Compensation expense			$ 81,000	$ 75,000	$ 82,000
Employee Stock Purchase Plan
Number of shares of common stock registered in connection with the establishment of an Employee Stock Purchase Plan			363,825				1,400,000
Requisite age of employees to be eligible to participate in the plan			21 years
Requisite service period to be eligible to participate in the plan			6 months
Discount rate for eligible employees to purchase company stock (as a percent)			5.00%			15.00%
Minimum \| Employee Stock Purchase Plan
Employee Stock Purchase Plan
Shares available for issuance under the plan			1,400,000
Maximum \| Employee Stock Purchase Plan
Employee Stock Purchase Plan
Estimated subscription date fair value (as a percent)			95.00%
Stock Options
Weighted-average assumptions
Dividend yield (as a percent)					1.46%
Expected life					8 years 6 months
Expected volatility (as a percent)					28.00%
Risk-free interest rate (as a percent)					2.54%
Additional disclosures
Total unrecognized compensation cost related to non vested stock option grants			$ 0
Total fair value of shares vested during the period			1,400,000	799,000	$ 700,000
Compensation expense			$ 720,000	641,000	751,000
Restricted Stock Activity and RSUs
Assumed restricted stock shares from CSFL merger (in shares)			136,831
Weighted-Average Grant-Date Fair Value
Assumed restricted stock shares from CSFL merger (in dollars per share)			$ 37.85
Stock Options \| CSFL
Additional disclosures
Vesting of stock options		$ 481,000
Restricted Stock
Share-Based Compensation
Options vested (in shares)			61,123
Additional disclosures
Weighted-average period over which unrecognized compensation cost is expected to be recognized			1 year 7 months 9 days
Compensation expense			$ 1,500,000	$ 1,700,000	$ 2,500,000
Options vested (in shares)			61,123
Vesting period hold			2 years
Restricted Stock Activity and RSUs
Nonvested at the beginning of the period (in shares)			69,450
Assumed restricted stock shares from CSFL merger (in shares)			9,755
Granted (in shares)			9,145	8,934	7,836
Vested (in shares)			(77,029)
Forfeited (in shares)			(317)
Nonvested at the end of the period (in shares)			11,004	69,450
Weighted-Average Grant-Date Fair Value
Nonvested at the beginning of the period (in dollars per share)			$ 58.96
Assumed restricted stock shares from CSFL merger (in dollars per share)			60.27
Granted (in dollars per share)			55.96	$ 73.34	$ 87.37
Vested (in dollars per share)			58.67
Forfeited (in dollars per share)			65.86
Nonvested at the end of the period (in dollars per share)			$ 59.42	$ 58.96
Additional disclosures
Total unrecognized compensation cost related to nonvested restricted stock and RSUs granted			$ 537,000,000
Total fair value of shares vested during the period			4,600,000	$ 3,000,000.0	$ 2,500,000
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value			$ 4,600,000	3,000,000.0	2,500,000
Restricted Stock \| Maximum
Additional disclosures
Vesting period			12 months
Restricted Stock \| Employees \| Minimum
Additional disclosures
Vesting period			4 years
Restricted Stock \| CSFL
Additional disclosures
Vesting of stock options		704,000
Restricted Stock Activity and RSUs
Vested (in shares)	(29,303)
Restricted Stock Units
Additional disclosures
Weighted-average period over which unrecognized compensation cost is expected to be recognized			2 years 9 months 18 days
Compensation expense			$ 21,000,000.0	$ 6,400,000	$ 5,500,000
Vesting period			3 years
Restricted Stock Activity and RSUs
Nonvested at the beginning of the period (in shares)			324,601
Assumed restricted stock shares from CSFL merger (in shares)			388,381
Granted (in shares)			382,205	159,521	113,270
Vested (in shares)			(275,661)
Forfeited (in shares)			(68,705)
Nonvested at the end of the period (in shares)			750,821	324,601
Weighted-Average Grant-Date Fair Value
Nonvested at the beginning of the period (in dollars per share)			$ 76.44
Assumed restricted stock shares from CSFL merger (in dollars per share)			60.27
Granted (in dollars per share)			61.27
Vested (in dollars per share)			75.63
Forfeited (in dollars per share)			74.09
Nonvested at the end of the period (in dollars per share)			$ 60.88	$ 76.44
Additional disclosures
Total unrecognized compensation cost related to nonvested restricted stock and RSUs granted			$ 27,700,000
Total fair value of shares vested during the period			$ 23,600,000	$ 5,800,000	$ 5,700,000
Target RSU award level (as a percent)			1.00%
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value			$ 23,600,000	$ 5,800,000	$ 5,700,000
Restricted Stock Units \| CSFL
Additional disclosures
Vesting of stock options		$ 7,500,000
Restricted Stock Activity and RSUs
Vested (in shares)	(242,018)
Performance based restricted stock units
Additional disclosures
Performance period			3 years
Other Performance based restricted stock units
Additional disclosures
Performance period			1 year
Timed based restricted stock units
Additional disclosures
Performance period			4 years