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Legal Settlement	12 Months Ended
Legal Settlement	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Legal Settlement	Legal Settlement In the second quarter of 2017, the Company entered into a $95 million confidential settlement agreement to resolve a litigation matter. Based on the terms of the agreement, the Company received the settlement within 120 days of the execution of the agreement. The receipt of the settlement resulted in a favorable pre-tax impact of $15 million in the second quarter of 2017 and $80 million in the third quarter of 2017, which was included in operating income.