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New Accounting Pronouncements (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
New Accounting Pronouncements    
Other long-term assets $ 23.9 $ 23.4
Total long-term debt, net of current portion (595.8) (595.6)
Accounting Standards Update 2015-03 | Reclassification    
New Accounting Pronouncements    
Other long-term assets (3.0) (3.1)
Total long-term debt, net of current portion $ 3.0 $ 3.1