Lines of Credit and Financing Arrangements (Outstanding Debt Obligations) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Short-Term Debt:
Total short-term debt	$ 327.8	$ 204.1
Current maturities of long-term debt:
Capital lease obligations	0.9	1.2
Total current maturities of long-term debt	215.6	31.0
Long-Term Debt:
Capital lease obligations	15.1	15.6
Debt issuance costs	(2.6)	(2.6)
Total long-term debt	512.5	506.0
Total debt	1,055.9	741.1
Domestic Credit Facility [Member]
Current maturities of long-term debt:
Domestic credit facility and senior unsecured notes	15.0	30.0
Debt issuance costs	(0.3)	(0.2)
Long-Term Debt:
Domestic credit facility and senior unsecured notes	500.0	293.0
Senior Unsecured Notes [Member]
Current maturities of long-term debt:
Domestic credit facility and senior unsecured notes	200.0	0.0
Long-Term Debt:
Domestic credit facility and senior unsecured notes	0.0	200.0
Asset Securitization Program [Member]
Short-Term Debt:
Total short-term debt	325.0	200.0
Foreign Obligations [Member]
Short-Term Debt:
Total short-term debt	$ 2.8	$ 4.1