Debt (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Debt
Total	$ 2,112.3	$ 1,208.9
Less: unamortized discount	(3.3)	(1.5)
Less: amounts due within one year and short-term borrowings	(36.5)	(83.6)
Total long-term debt	2,072.5	1,123.8
Unsecured revolving credit facility due April 4, 2018
Debt
Total	480.0	525.0
Senior unsecured term loan due from March 31, 2014 to April 4, 2018
Debt
Total	467.5
Senior unsecured notes repaid on July 2, 2013
Debt
Total		75.0
Senior unsecured notes due November 15, 2016
Debt
Total	350.0	350.0
Senior unsecured notes due April 15, 2023
Debt
Total	500.0
Senior unsecured notes due November 15, 2036
Debt
Total	250.0	250.0
Other notes and revolving credit facilities
Debt
Total	$ 64.8	$ 8.9