Shareholders' Equity (Schedule of Dividends Paid and Dividends Declared) (Details) - USD ($) $ / shares in Units, $ in Millions	2 Months Ended	12 Months Ended
	Feb. 25, 2021	Dec. 31, 2020
February 20, 2020 [Member]
Date Declared		Feb. 20, 2020
Payable to Shareholders of Record At the Close of Business on		Mar. 10, 2020
Cash Paid Per Share		$ 0.465
Aggregate Amount Paid		$ 52.2
Date Paid/Date to be Paid		Mar. 26, 2020
May 5, 2020 [Member]
Date Declared		May 05, 2020
Payable to Shareholders of Record At the Close of Business on		May 28, 2020
Cash Paid Per Share		$ 0.465
Aggregate Amount Paid		$ 52.0
Date Paid/Date to be Paid		Jun. 18, 2020
August 3, 2020 [Member]
Date Declared		Aug. 03, 2020
Payable to Shareholders of Record At the Close of Business on		Aug. 25, 2020
Cash Paid Per Share		$ 0.465
Aggregate Amount Paid		$ 52.0
Date Paid/Date to be Paid		Sep. 21, 2020
November 2, 2020 [Member]
Date Declared		Nov. 02, 2020
Payable to Shareholders of Record At the Close of Business on		Nov. 19, 2020
Cash Paid Per Share		$ 0.465
Aggregate Amount Paid		$ 51.5
Date Paid/Date to be Paid		Dec. 17, 2020
Subsequent Event [Member]
Date Declared	Feb. 19, 2021
Payable to Shareholders of Record At the Close of Business on	Mar. 10, 2021
Cash to be Paid Per Share	$ 0.58
Date Paid/Date to be Paid	Mar. 26, 2021