Lines of Credit and Financing Arrangements (Outstanding Debt Obligations) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Short-Term Debt:
Total short-term debt	$ 251.3	$ 52.4
Current maturities of long-term debt:
Capital lease obligations	0.6	0.8
Total current maturities of long-term debt	15.0	200.1
Long-Term Debt:
Capital lease obligations	14.8	15.0
Debt issuance costs	(4.7)	(5.3)
Total long-term debt	922.6	615.7
Total debt	1,188.9	868.2
Domestic Credit Facility [Member]
Current maturities of long-term debt:
Domestic credit facility and senior unsecured notes	15.0	0.0
Debt issuance costs	(0.6)	(0.7)
Long-Term Debt:
Domestic credit facility and senior unsecured notes	562.5	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	250.0	50.0
Foreign Obligations [Member]
Short-Term Debt:
Total short-term debt	$ 1.3	$ 2.4