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Share-Based Compensation - Stock Options (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended			192 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019
Number of shares
Exercisable at the end of the period (in shares)		140,115
Stock Options
Number of shares
Outstanding at the beginning of the period (in shares)	213,866	218,689	246,535
Granted (in shares)		34,407	33,634
Exercised (in shares)	(36,978)	(33,424)	(59,480)
Forfeited (in shares)		(5,806)	(2,000)
Outstanding at the end of the period (in shares)	176,888	213,866	218,689	176,888
Exercisable at the end of the period (in shares)	131,216	140,115	148,702	131,216
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 61.28	$ 52.75	$ 42.53
Granted (in dollars per share)		91.05	91.23
Exercised (in dollars per share)	33.26	30.88	33.03
Forfeited (in dollars per share)		91.35	26.01
Outstanding at the end of the period (in dollars per share)	67.14	61.28	52.75	$ 67.14
Exercisable at the end of the period (in dollars per share)	$ 60.12	49.41	41.62	$ 60.12
Weighted-average fair value of options granted during the year (in dollars per share)		$ 28.01	$ 35.42
Aggregate Intrinsic Value
Outstanding at the end of the period	$ 3.7	$ 1.9	$ 7.7	$ 3.7
Exercisable at the end of the period	3.6	1.9	6.8	$ 3.6
Exercised at the end of the period	$ 1.4	$ 2.0	$ 3.3
Incentive stock options | Maximum
Share-Based Compensation
Vesting period	4 years
2019 plan
Share-Based Compensation
Number of shares registered	1,000,000			1,000,000
2004 plan
Number of shares
Granted (in shares)				0
Plan 2004 And 2012 | Incentive stock options
Share-Based Compensation
Vesting percentage	25.00%
Expiration period	10 years

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