Share-Based Compensation - Schedule of the Transactions of the Company's Stock Options (Details) shares in Millions	3 Months Ended
	Mar. 31, 2019 $ / shares shares
Stock Options
Unexercised options outstanding at the beginning of the period (in shares) | shares	0.5
Options granted (in shares) | shares	0.0
Options exercised (in shares) | shares	0.0
Options forfeited (in shares) | shares	0.0
Unexercised options outstanding at the end of the period (in shares) | shares	0.5
Exercisable at the end of the period (in shares) | shares	0.4
Weighted Average Exercise Price
Unexercised options outstanding at the beginning of the period (in dollars per share) | $ / shares	$ 130.81
Options granted (in dollars per share) | $ / shares	110.02
Options exercised (in dollars per share) | $ / shares	107.63
Options forfeited (in dollars per share) | $ / shares	122.67
Unexercised options outstanding at the end of the period (in dollars per share) | $ / shares	130.54
Exercisable at the end of the period (in dollars per share) | $ / shares	$ 129.01
Weighted Average Remaining Contractual Life (Years)
Unexercised options outstanding at the end of the period (in years)	3 years 8 months 12 days
Exercisable at the end of the period (in years)	3 years 5 months 12 days