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Investments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items] |  |
Auction rate securities, amortized cost | $ 0.4 | $ 0.3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 5.4 | 4.3
Auction rate securities, gross unrealized losses | 0.0 | 0.0
Auction rate securities, fair value | 5.8 | 4.6
Par Value Available For Sale Securities | 23.4 |
Auction Rate Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Auction rate securities, amortized cost | 0.4 | 0.3
Available-for-sale Securities, Gross Unrealized Gain | 5.4 | 4.3
Auction rate securities, gross unrealized losses | 0.0 | 0.0
Auction rate securities, fair value | $ 5.8 | $ 4.6

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