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Employee Benefit Plans (Details 2) (Defined benefit pension plan, USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined benefit plans
Investments at fair value	$ 805.8	$ 721.1	$ 656.3
Quoted prices in active markets for identical assets (Level 1) \| Recurring Basis
Defined benefit plans
Investments at fair value	61.2	67.5
Significant other observable inputs (Level 2) \| Recurring Basis
Defined benefit plans
Investments at fair value	741.2	648.2
Significant unobservable inputs (Level 3) \| Recurring Basis
Defined benefit plans
Investments at fair value	3.4	5.4
Total \| Recurring Basis
Defined benefit plans
Investments at fair value	805.8	721.1
Cash and cash equivalents \| Quoted prices in active markets for identical assets (Level 1) \| Recurring Basis
Defined benefit plans
Investments at fair value	0.6	3.2
Cash and cash equivalents \| Total \| Recurring Basis
Defined benefit plans
Investments at fair value	0.6	3.2
Registered investment companies, Cash management fund \| Quoted prices in active markets for identical assets (Level 1) \| Recurring Basis
Defined benefit plans
Investments at fair value	1.8	1.0
Registered investment companies, Cash management fund \| Total \| Recurring Basis
Defined benefit plans
Investments at fair value	1.8	1.0
Registered investment companies, Equity funds \| Quoted prices in active markets for identical assets (Level 1) \| Recurring Basis
Defined benefit plans
Investments at fair value	58.8	49.1
Registered investment companies, Equity funds \| Total \| Recurring Basis
Defined benefit plans
Investments at fair value	58.8	49.1
Registered investment companies, Fixed income funds \| Quoted prices in active markets for identical assets (Level 1) \| Recurring Basis
Defined benefit plans
Investments at fair value		14.2
Registered investment companies, Fixed income funds \| Total \| Recurring Basis
Defined benefit plans
Investments at fair value		14.2
Fixed income securities \| Significant other observable inputs (Level 2) \| Recurring Basis
Defined benefit plans
Investments at fair value	42.6	35.1
Fixed income securities \| Total \| Recurring Basis
Defined benefit plans
Investments at fair value	42.6	35.1
Private investment funds-redeemable \| Significant other observable inputs (Level 2) \| Recurring Basis
Defined benefit plans
Investments at fair value	698.6	613.1
Private investment funds-redeemable \| Total \| Recurring Basis
Defined benefit plans
Investments at fair value	698.6	613.1
Equity index funds
Defined benefit plans
Actual asset allocation (as a percent)	42.00%	46.00%
Fixed income investments
Defined benefit plans
Actual asset allocation (as a percent)	57.00%	54.00%
Other investments
Defined benefit plans
Actual asset allocation (as a percent)	1.00%
Private investment funds-non-redeemable \| Significant unobservable inputs (Level 3) \| Recurring Basis
Defined benefit plans
Investments at fair value	0.1	1.0	0.3
Private investment funds-non-redeemable \| Total \| Recurring Basis
Defined benefit plans
Investments at fair value	0.1	1.0
Insurance annuity contracts \| Significant unobservable inputs (Level 3) \| Recurring Basis
Defined benefit plans
Investments at fair value	3.3	4.4	4.4
Insurance annuity contracts \| Total \| Recurring Basis
Defined benefit plans
Investments at fair value	$ 3.3	$ 4.4

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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