Financing Arrangements (Details 1) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Long-term debt
Total Long-term debt	$ 605.1	$ 640.0
Less current maturities	5.0	5.0
Long-term debt	600.1	635.0
Senior Unsecured Notes - 3.875% [Member]
Long-term debt
Total Long-term debt	346.1	345.9
Senior Unsecured Notes - Variable Rate [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	457.2
Long-term debt
Total Long-term debt	42.8	83.8
Series A Medium Term Note [Member]
Long-term debt
Total Long-term debt	159.5	159.5
Other Long Term Debt [Member]
Long-term debt
Total Long-term debt	1.7	1.9
Line of Credit Accounts Receivable Securitization [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	23.4
Line of Credit Accounts Receivable Securitization [Member] | Line of Credit [Member]
Long-term debt
Total Long-term debt	$ 55.0	$ 48.9