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Consolidated Statements of Cash Flows (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Cash Flows [Abstract]      
Cash consideration, exclusive of cash transferred $ 108.6 $ 13.5
Repurchase of senior notes, premiums paid 30.6  
Income tax refunds $ 8.8 $ 10.0 $ 9.4