Shareholders' Equity and Other Comprehensive Income (Loss) (Non-vested Shares/Units) (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2020 $ / shares shares
Quantity
Non-vested, beginning balance (in shares) | shares	1,312
Granted (in shares) | shares	689
Quantity change by TSR factor (in shares) | shares	23
Dividend equivalents granted (in shares) | shares	12
Vested (in shares) | shares	(556)
Forfeited (in shares) | shares	(5)
Non-vested, ending balance (in shares) | shares	1,475
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	36.63
Quantity change by TSR factor (in dollars per share) | $ / shares	36.63
Dividend equivalents granted (in dollars per share) | $ / shares	36.63
Vested (in dollars per share) | $ / shares	39.25
Forfeited (in dollars per share) | $ / shares	36.63
Non-vested, ending balance (in dollars per share) | $ / shares	$ 38.01