Subsequent Events (Details)			3 Months Ended				12 Months Ended
	Feb. 26, 2020 $ / shares	Feb. 03, 2020 day $ / shares shares	Dec. 31, 2019 $ / shares	Sep. 30, 2019 $ / shares	Jun. 30, 2019 $ / shares	Mar. 31, 2019 $ / shares	Dec. 31, 2019 $ / shares	Dec. 31, 2018 $ / shares	Dec. 31, 2017 $ / shares
Subsequent Event [Line Items]
Cash dividends declared per common share (in $ per share)			$ 0.67	$ 0.67	$ 0.55	$ 0.55	$ 2.44	$ 2	$ 1.8
Subsequent Event
Subsequent Event [Line Items]
Preferred stock conversion, threshold consecutive trading days | day		20
Cash dividends declared per common share (in $ per share)	$ 0.67
Convertible preferred stock | Subsequent Event
Subsequent Event [Line Items]
Preferred stock, shares issuable upon conversion (in shares) | shares		1,150,000
Conversion ratio		0.7938
Conversion price of stock ($ per share)		$ 125.97
Common Stock | Subsequent Event
Subsequent Event [Line Items]
Shares issued during period, conversion of convertible preferred stock (in shares) | shares		912,870