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Consolidated Statements of Cash Flows (Parenthetical) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Cash Flows [Abstract]      
Use of restricted cash - acquisition of Eagle Ottawa $ 0.0 $ 0.0 $ (350.0)
Use of restricted cash - repurchase of senior notes 0.0 0.0 (250.0)
Cash paid in conjunction with acquisition of Eagle Ottawa to settle pre-existing accounts payable     45.7
Income tax refunds received $ 35.5 $ 16.4 $ 11.9