Fair Value Disclosures (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair value assets	$ 19.5	$ 22.7
Equity Funds [Member]
Fair value assets	13.3	15.9
Common Stock [Member]
Fair value assets	4.9	5.1
Money Market Funds [Member]
Fair value assets	1.3	1.7
Interest-bearing Deposits [Member]
Fair value assets	64.3
Estimate Of Fair Value, Fair Value Disclosure [Member]
Foreign currency forward contracts (asset position)	28.0	16.9
Foreign currency forward contracts (liability position)	9.6	19.3
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Foreign currency forward contracts (asset position)	0	0
Foreign currency forward contracts (liability position)	0	0
Fair value assets	19.5	22.7
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Equity Funds [Member]
Fair value assets	13.3	15.9
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Common Stock [Member]
Fair value assets	4.9	5.1
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Money Market Funds [Member]
Fair value assets	1.3	1.7
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Interest-bearing Deposits [Member]
Fair value assets	0
Significant Other Observable Inputs (Level 2) [Member]
Foreign currency forward contracts (asset position)	28.0	16.9
Foreign currency forward contracts (liability position)	9.6	19.3
Fair value assets	0	0
Significant Other Observable Inputs (Level 2) [Member] | Equity Funds [Member]
Fair value assets	0	0
Significant Other Observable Inputs (Level 2) [Member] | Common Stock [Member]
Fair value assets	0	0
Significant Other Observable Inputs (Level 2) [Member] | Money Market Funds [Member]
Fair value assets	0	0
Significant Other Observable Inputs (Level 2) [Member] | Interest-bearing Deposits [Member]
Fair value assets	64.3
Significant Unobservable Inputs (Level 3) [Member]
Foreign currency forward contracts (asset position)	0	0
Foreign currency forward contracts (liability position)	0	0
Fair value assets	0	0
Significant Unobservable Inputs (Level 3) [Member] | Equity Funds [Member]
Fair value assets	0	0
Significant Unobservable Inputs (Level 3) [Member] | Common Stock [Member]
Fair value assets	0	0
Significant Unobservable Inputs (Level 3) [Member] | Money Market Funds [Member]
Fair value assets	0	0
Significant Unobservable Inputs (Level 3) [Member] | Interest-bearing Deposits [Member]
Fair value assets	$ 0