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Consolidated Balance Sheet (Parenthetical) - shares
shares in Millions
Mar. 31, 2018
Dec. 31, 2017
[1]
Statement of Financial Position [Abstract]    
Common stock - issued shares 182.1 181.0
Common stock - outstanding shares 182.1 181.0
[1] See Note 3 - Revenues from Contracts with Customers for additional information about the restatements related to ASC 606.