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Common Shares and Earnings per Share Share Repurchase Programs (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		1 Months Ended		3 Months Ended
	Mar. 02, 2020	Feb. 29, 2020	Dec. 31, 2019	Feb. 29, 2020	Feb. 28, 2019	Mar. 01, 2020	Dec. 01, 2019	Nov. 30, 2019
Equity, Class of Treasury Stock [Line Items]
Dividends Payable, Amount Per Share		$ 0.17		$ 0.17
Payments of Dividends				$ 67.7	$ 0.0
Dividends, Common Stock, Paid-in-kind				1.3
Dividends, Common Stock, Cash				$ 69.0
Shares held in employee benefit trust, shares		25,200		25,200
Stock repurchase program October 2019
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount								$ 2,500.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 2,000.0		$ 2,000.0
Stock Repurchase Plan December 2019
Equity, Class of Treasury Stock [Line Items]
Accelerated Share Repurchases, Settlement (Payment) or Receipt							$ 500.0
Repurchases of common shares, shares		944	5,547
Subsequent Event [Member] \| Stock Repurchase Plan March 2020
Equity, Class of Treasury Stock [Line Items]
Accelerated Share Repurchases, Settlement (Payment) or Receipt						$ 250.0
Repurchases of common shares, shares	2,807