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Financial Information for Subsidiary and Guarantor Parent (Changes) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]        
Current assets $ 2,122.4   $ 1,915.7  
Assets 5,389.0   5,185.4  
Current liabilities 730.6   712.6  
Liabilities 3,305.8   3,340.9  
Stockholders' equity 2,083.2 $ 1,447.5 $ 1,844.5 $ 1,444.8
Cash flows provided by (used in) operating activities 116.6 (53.8)    
Net Cash Provided by (Used in) Investing Activities (109.1) (82.1)    
Cash provided by financing activities $ 4.4 $ 31.2