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Financial Information for Subsidiary and Guarantor Parent (Changes) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Current assets	$ 2,126.3		$ 1,915.7
Assets	5,393.3		5,185.4
Current liabilities	741.3		712.6
Liabilities	3,351.4		3,340.9
Stockholders' equity	2,041.9	$ 1,514.4	$ 1,844.5	$ 1,444.8
Cash flows provided by (used in) operating activities	35.0	(85.5)
Net Cash Provided by (Used in) Investing Activities	(69.8)	(52.0)
Cash provided by financing activities	$ 15.6	$ 62.5

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