Stock-Based Compensation Plans (Details) - shares	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
Stock options [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Shares granted		407,637
Performance Shares [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Shares granted		154,351
Restricted Stock Units [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Shares granted	7,869	443,734
Non-employee Stock Appreciation Rights [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Shares granted		26,494
Non-employee Agent Stock Options [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Shares granted	90	102,728
Non-employee Director Deferred Stock Units [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Shares granted	6,110	20,644