Lines of Credit and Financing Arrangements (Outstanding Debt Obligations) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Short-Term Debt:
Total short-term debt	$ 326.0	$ 52.4
Current maturities of long-term debt:
Capital lease obligations	0.5	0.8
Total current maturities of long-term debt	22.4	200.1
Long-Term Debt:
Capital lease obligations	14.7	15.0
Debt issuance costs	(4.5)	(5.3)
Total long-term debt	775.7	615.7
Total debt	1,124.1	868.2
Domestic Credit Facility [Member]
Current maturities of long-term debt:
Domestic credit facility and senior unsecured notes	22.5	0.0
Debt issuance costs	(0.6)	(0.7)
Long-Term Debt:
Domestic credit facility and senior unsecured notes	415.5	256.0
Senior Unsecured Notes [Member]
Current maturities of long-term debt:
Domestic credit facility and senior unsecured notes	0.0	200.0
Long-Term Debt:
Domestic credit facility and senior unsecured notes	350.0	350.0
Asset Securitization Program [Member]
Short-Term Debt:
Total short-term debt	325.0	50.0
Foreign Obligations [Member]
Short-Term Debt:
Total short-term debt	$ 1.0	$ 2.4