Shareholders' Equity - Narrative (Details) - USD ($)						1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 23, 2019	Sep. 24, 2019	Mar. 13, 2019	Oct. 23, 2018	Sep. 26, 2018	Feb. 28, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Class of Stock [Line Items]
Common stock, dividend declared (in dollars per share)		$ 3.50			$ 2.50	$ 2.50	$ 3.50	$ 2.50	$ 3.50	$ 2.50
Common stock, cash dividends paid				$ 304,700,000		$ 1,200,000
Subsequent event
Class of Stock [Line Items]
Common stock, cash dividends paid	$ 427,700,000
Common Shares
Class of Stock [Line Items]
Shares paid for tax withholding for share based compensation (in shares)									168,327	57,348
Share Repurchase Program, March 13, 2019
Class of Stock [Line Items]
Stock repurchase program, period in force			12 months
Share Repurchase Program, March 13, 2019 | Common Shares
Class of Stock [Line Items]
Stock repurchase program, authorized amount (up to)			$ 150,000,000.0
Repurchase of shares (in shares)									0
Stock repurchase program, remaining authorized repurchase amount							$ 150,000,000.0		$ 150,000,000.0