Shareholders' Equity and Other Comprehensive Income (Loss) (Non-vested Shares/Units) (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2020 $ / shares shares
Quantity
Non-vested, beginning balance (in shares) | shares	1,312
Granted (in shares) | shares	893
Quantity change by TSR factor (in shares) | shares	44
Dividend equivalents granted (in shares) | shares	56
Vested (in shares) | shares	(590)
Forfeited (in shares) | shares	(58)
Non-vested, ending balance (in shares) | shares	1,657
Weighted-Average Grant Date Fair Value Per Share
Non-vested, beginning balance (in dollars per share) | $ / shares	$ 39.28
Granted (in dollars per share) | $ / shares	32.91
Quantity change by TSR factor (in dollars per share) | $ / shares	35.11
Dividend equivalents granted (in dollars per share) | $ / shares	33.50
Vested (in dollars per share) | $ / shares	38.85
Forfeited (in dollars per share) | $ / shares	36.22
Non-vested, ending balance (in dollars per share) | $ / shares	$ 35.80