Employee Benefit Plans (Details 5) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended				12 Months Ended			0 Months Ended	3 Months Ended		12 Months Ended
	Mar. 29, 2014 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($) item	Dec. 31, 2014 Pension plans USD ($)	Dec. 31, 2013 Pension plans USD ($)	Dec. 31, 2014 Domestic Pension Plans USD ($)	Dec. 31, 2013 Domestic Pension Plans USD ($)	Dec. 31, 2012 Domestic Pension Plans USD ($)	Dec. 31, 2014 Foreign Pension Plans USD ($) item	Dec. 31, 2014 Foreign Pension Plans USD ($)	Dec. 31, 2014 Foreign Pension Plans GBP (£)	Dec. 31, 2014 Foreign Pension Plans USD ($) item	Dec. 31, 2014 Foreign Pension Plans GBP (£)	Dec. 31, 2013 Foreign Pension Plans USD ($)	Dec. 31, 2012 Foreign Pension Plans USD ($)	Dec. 31, 2014 Postretirement Plans USD ($)	Dec. 31, 2013 Postretirement Plans USD ($)	Dec. 31, 2012 Postretirement Plans USD ($)
Employee benefit plans
Non-funded plan, current underfunded status				$ 210.0
Change in benefit obligation:
Benefit obligation - beginning of year:						568.8	1,345.8		239.6			335.6		323.0		131.5	148.7
Service cost						7.1	7.6	9.8				2.6		2.7	2.8	0.4	0.5	0.5
Interest cost						19.9	45.6	54.4				13.8		13.4	14.6	5.3	4.8	6.1
Employee contributions												0.1		0.2
Actuarial losses (gains)	14.8					59.5	(49.8)					55.3		9.6		14.2	(7.8)
Settlements		15.0				160.4	708.8					127.7
Plan amendment												(0.2)				7.5
Benefits paid						(39.6)	(71.6)					(16.0)		(14.8)		(13.7)	(14.7)
Foreign exchange and other												(23.9)		1.5
Benefit obligation - end of year:						455.3	568.8	1,345.8		239.6		239.6		335.6	323.0	130.2	131.5	148.7
Amount paid for obligations assumed by third party	4.8		663.7							123.3	79.2	123.3	79.2
Number of retirees assumed by third party for future pension payments			16,000						900			900	900
Lump sum settlements paid to Plan participants			45.1									4.4	2.8
Projected benefit obligation of the Plan settled as a result of lump-sum payments	165.2
Change in plan assets:
Fair value of plan assets - beginning of year				492.4	770.4	467.3	936.8		186.7			303.1		277.0
Actual return on plan assets						28.1	26.7					32.9		19.1
Contributions (employer and employee)						10.3	284.2					10.8		16.8
Settlements loss		(15.0)				(160.4)	(708.8)					(127.7)
Benefits paid						(39.6)	(71.6)					(16.0)		(14.8)		(13.7)	(14.7)
Benefits paid												(12.8)		(11.1)
Foreign exchange and other												(19.6)		1.3
Fair value of plan assets - end of year				492.4	770.4	305.7	467.3	936.8		186.7		186.7		303.1	277.0
Funded status at year-end						(149.6)	(101.5)			(52.9)		(52.9)		(32.5)		(130.2)	(131.5)
Amounts recognized in the consolidated balance sheets consist of:
Other assets						3.3	38.2			15.6		15.6		36.2
Accrued expenses						(10.3)	(8.9)			(2.4)		(2.4)		(2.7)		(12.6)	(13.7)
Other long-term liabilities						(142.6)	(130.8)			(66.1)		(66.1)		(66.0)		(117.6)	(117.8)
Net amount recognized						(149.6)	(101.5)			(52.9)		(52.9)		(32.5)		(130.2)	(131.5)
Amount recognized in accumulated other comprehensive income (pre-tax) consists of:
Net prior service credits						$ (0.2)	$ (0.1)			$ (0.2)		$ (0.2)		$ (0.1)		$ (7.5)	$ (0.3)