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Share-Based Compensation - Schedule of Company Restricted Stock Units Transactions (Details) - Restricted Stock Units - USD ($) $ / shares in Units, shares in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Restricted Stock Units
Unvested units - December 31, 2018 (in shares)	0.6
Units granted (in shares)	0.3
Units vested (in shares)	(0.2)
Units forfeited (in shares)	(0.0)
Unvested units - June 30, 2019 (in shares)	0.7
Weighted Average Grant Date Value
Unvested units - December 31, 2018 (in dollars per share)	$ 172.74
Units granted (in dollars per share)	110.02
Units vested (in dollars per share)	169.23
Units forfeited (in dollars per share)	163.21
Unvested units - June 30, 2019 (in dollars per share)	$ 143.94
Restricted stocks granted, fair value	$ 36.0	$ 36.7
Minimum
Weighted Average Grant Date Value
Restricted stock, vesting period	3 years
Maximum
Weighted Average Grant Date Value
Restricted stock, vesting period	4 years

X

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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