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Quarterly Financial Summary (Unaudited) Quarterly Financial Summary (Unaudited) - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Mar. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |  |  |  |
Actuarial loss (gain) | $ (38.9) | $ 112.6 | $ 2.8 | $ 15.4
Actuarial loss (gain), net of income tax | $ (27.8) | $ 71.8 | $ 1.8 | $ 9.8

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- Definition Mark-to-market adjustments for the gain or losses occurring on pension or postretirement plans during the year, and any mark-to-market true-up or other adjustments, net of income taxes. + References No definition available. + Details
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