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Share-Based Compensation - Summary of Transactions of the Company's Restricted Stock (Details) - Restricted Stock
shares in Millions
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Restricted Stock  
Units outstanding at the beginning of the period (in shares) | shares 0.6
Units granted (in shares) | shares 0.2
Units vested (in shares) | shares (0.2)
Units forfeited (in shares) | shares 0.0
Units outstanding at the end of the period (in shares) | shares 0.6
Weighted Average Grant Date Value  
Units outstanding at the beginning of the period (in usd per share) | $ / shares $ 192.04
Units granted (in usd per share) | $ / shares 122.59
Units vested (in usd per share) | $ / shares 181.87
Units forfeited (in usd per share) | $ / shares 171.51
Units outstanding at the end of the period (in usd per share) | $ / shares $ 168.84