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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	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Restricted Stock Units
Unvested units - December 31, 2018 (in shares)	0.6
Units granted (in shares)	0.6
Units vested (in shares)	(0.2)
Units forfeited (in shares)	(0.0)
Unvested units - September 30, 2019 (in shares)	1.0
Weighted Average Grant Date Value
Unvested units - December 31, 2018 (in dollars per share)	$ 172.74
Units granted (in dollars per share)	91.52
Units vested (in dollars per share)	168.95
Units forfeited (in dollars per share)	143.55
Unvested units - September 30, 2019 (in dollars per share)	$ 121.11
Restricted stocks granted, fair value	$ 60.6	$ 37.7
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 over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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