Stock-Based Compensation (Performance Share Awards Activity) (Details) - Performance shares	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Performance Shares
Balance at beginning of period (in shares) | shares	1,286,686
Grants (in shares) | shares	446,579
Forfeitures (in shares) | shares	(44,044)
Payouts (in shares) | shares	(463,190)
Balance at end of period (in shares) | shares	1,226,031
Weighted Average Grant Date Fair Value
Balance at beginning of period (in dollars per share) | $ / shares	$ 97.17
Grants (in dollars per share) | $ / shares	115.85
Forfeitures (in dollars per share) | $ / shares	102.42
Payouts (in dollars per share) | $ / shares	88.53
Balance at end of period (in dollars per share) | $ / shares	$ 107.35