Debt (Schedule of Borrowings) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016	Sep. 10, 2016
Debt Instrument [Line Items]
Borrowings under revolving credit agreements and other short-term notes	$ 3.7	$ 2.9	$ 1.2
Capital lease obligations	0.5	0.5	0.6
Unamortized debt issuance costs	(6.9)	(8.3)	(13.1)
Total debt	796.7	820.7	1,052.4
Term Loan A [Member] \| July Thirteenth Two Thousand Twenty [Member]
Debt Instrument [Line Items]
Long-term debt	549.4	575.6	438.7
Senior Notes [Member] \| September First Two Thousand Twenty Six [Member]
Debt Instrument [Line Items]
Long-term debt	250.0	250.0	250.0
Public Bonds [Member] \| October Fifteen Two Thousand Twenty [Member]
Debt Instrument [Line Items]
Long-term debt	$ 0.0	$ 0.0	$ 375.0

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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