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Equity - Narrative (Details) - shares	6 Months Ended
	Jun. 30, 2017	Dec. 04, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum interest in joint venture (as a percent)	20.00%
Agreement terms, change of control, put option for minority interest ownership, effective period (in days)	15 days
2013 Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized for repurchase (in shares)		50,000,000
Shares authorized for repurchase, compared to total common stock outstanding (as a percent)		18.00%
Remaining shares available under repurchase program	23,200,000
S&P Dow Jones LLC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Noncontrolling interest ownership by noncontrolling owners (as a percent)	27.00%

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