Retirement Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2012

Retirement Benefit Plans [Abstract]

Components of net pension expense

	Three Months Ended June 30,						Six Months Ended June 30,
	2012			2011			2012			2011
Service cost	$	6.1		$	7.2		$	12.9		$	14.1
Interest cost		4.6			5.2			9.6			10.2
Expected return on plan assets		(8.2	)		(8.0	)		(16.5	)		(15.8	)
Settlement		0.7			—			0.7			—
Amortization of prior service cost		(1.2	)		(0.2	)		(1.4	)		(0.4	)
Amortization of unrecognized actuarial loss		3.3			1.8			6.7			3.7
Net periodic benefit cost	$	5.3		$	6.0		$	12.0		$	11.8