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General (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Apr. 01, 2018	Mar. 31, 2018	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment for new accounting pronouncement			$ 18.7
Decrease in cash provided by operating activities	$ 113.3	$ 66.8
Increase in beginning cash and cash equivalents to include restricted cash				$ 378.1	$ 324.7
Restricted cash	$ 0.0			$ 0.0
Revenue Recognition ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment for new accounting pronouncement			18.7
Liability for sales returns and certain sales incentive allowances			86.9
Restricted Cash
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in cash provided by operating activities		$ 2.8
Increase in beginning cash and cash equivalents to include restricted cash					$ 2.8
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment for new accounting pronouncement			21.3
Retained Earnings | Recognition and Measurement of Financial Instruments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment for new accounting pronouncement			$ (2.6)

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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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