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Stockholders' Equity - Share Repurchase Program (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
Equity [Abstract]
Common stock repurchased and retired, shares | shares	1,987,187
Common stock repurchased and retired, weighted average price per share | $ / shares	$ 50.49
Common stock repurchased and retired, total value | $	$ 100.3

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Total cost of shares repurchased divided by the total number of shares repurchased.

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