Debt (Details) In Millions, unless otherwise specified	Jun. 30, 2012 USD ($)	Jun. 30, 2012 JPY (¥)	Dec. 31, 2011 USD ($)	Jun. 30, 2012 Senior Notes due 2014 [Member] USD ($)	Dec. 31, 2011 Senior Notes due 2014 [Member] USD ($)	Jun. 30, 2012 Senior Notes due 2019 [Member] USD ($)	Dec. 31, 2011 Senior Notes due 2019 [Member] USD ($)	Jun. 30, 2012 Senior Notes due 2021 [Member] USD ($)	Dec. 31, 2011 Senior Notes due 2021 [Member] USD ($)	Jun. 30, 2012 Senior Notes due 2039 [Member] USD ($)	Dec. 31, 2011 Senior Notes due 2039 [Member] USD ($)	Jun. 30, 2012 Senior Notes [Member] USD ($)	Dec. 31, 2011 Senior Notes [Member] USD ($)
Short-term Debt
Senior Credit Facility			$ 143.0
Other short-term debt	3.4		0.3
Total short-term debt	3.4		143.3
Long term debt
Senior notes due				250.0	250.0	500.0	500.0	300.0	300.0	500.0	500.0
Term loan	145.4	11,700.0
Debt discount												(1.8)	(1.8)
Adjustment related to interest rate swaps	32.9		27.8
Total long-term debt	$ 1,726.5		$ 1,576.0