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Earnings per Common Share - Schedule of Warrant Activity (Details) - $ / shares shares in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Jan. 17, 2017 | Dec. 31, 2017 | Sep. 30, 2009
Class of Warrant or Right [Line Items] |  |  |
Expired | (1.1) |  |
Common stock warrants outstanding as of January 17, 2017 | 0.0 |  |
Weighted average exercise price (in dollars per share) | $ 41.40 | $ 41.40 | $ 41.40
Cashless exercise [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Exercised | (6.5) |  |
Weighted average exercise price (in dollars per share) | $ 41.40 |  |
Cash exercise [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Exercised | (0.6) |  |
Weighted average exercise price (in dollars per share) | $ 41.40 |  |

X
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares. + References No definition available. + Details
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