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Financial Information for Subsidiary and Guarantor Parent (Changes) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]        
Current assets $ 2,177.9   $ 2,246.7  
Assets 5,491.0   5,501.8  
Current liabilities 760.0   836.9  
Liabilities 3,444.4   3,510.2  
Stockholders' equity 2,046.6 $ 1,963.3 $ 1,991.6 $ 1,844.5
Cash flows provided by (used in) operating activities (130.0) (47.1)    
Net Cash Provided by (Used in) Investing Activities (23.6) (41.5)    
Cash (used in) provided by financing activities $ (11.4) $ 56.9