Share-Based Compensation Plans (Details 3) shares in Thousands	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Time-Vested
Summary of Nonvested stock awards
Nonvested stock outstanding at January 1 (in shares) | shares	473
Granted (in shares) | shares	133
Vested (in shares) | shares	(104)
Forfeited (in shares) | shares	(26)
Nonvested stock outstanding at December 31 (in shares) | shares	476
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested stock outstanding at January 1, Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares	$ 68.50
Granted, weighted-Average grant date fair value (in dollars per share) | $ / shares	57.83
Vested,Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares	58.83
Forfeited, Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares	74.11
Nonvested stock outstanding at December 31, Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares	$ 67.31
Market-Based
Summary of Nonvested stock awards
Nonvested stock outstanding at January 1 (in shares) | shares	62
Granted (in shares) | shares	34
Vested (in shares) | shares	(21)
Forfeited (in shares) | shares	(9)
Nonvested stock outstanding at December 31 (in shares) | shares	66
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested stock outstanding at January 1, Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares	$ 66.97
Granted, weighted-Average grant date fair value (in dollars per share) | $ / shares	54.10
Vested,Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares	53.43
Forfeited, Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares	69.10
Nonvested stock outstanding at December 31, Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares	$ 64.33
Performance-Based
Summary of Nonvested stock awards
Nonvested stock outstanding at January 1 (in shares) | shares	76
Granted (in shares) | shares	45
Vested (in shares) | shares	(39)
Forfeited (in shares) | shares	(10)
Nonvested stock outstanding at December 31 (in shares) | shares	72
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested stock outstanding at January 1, Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares	$ 83.31
Granted, weighted-Average grant date fair value (in dollars per share) | $ / shares	55.32
Vested,Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares	74.35
Forfeited, Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares	63.95
Nonvested stock outstanding at December 31, Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares	$ 70.92