Employee Benefit Plans (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Decrease in estimated service and interest cost	$ 0.6		$ 2.4
Settlement (gain) loss recognized during the period		$ 1.7
Accumulated other comprehensive income (loss), net of tax		$ 47.3		$ 37.5	$ 47.3	$ 32.1
Future funding requirements				$ 0.2
Defined matching contribution plan				50.00%		100.00%
Eligible employee contributions				2.00%		3.00%
Contribtions to defined contribution plan				$ 7.4	$ 6.5	$ 5.5
Number of Company's common shares included in savings plan assets		1.1		0.9	1.1
Value of Company's common shares included in plan assets		$ 21.8		$ 23.6	$ 21.8
Fair value of plan assets for postretirement health		150.5		$ 157.2	150.5
Defined Contribution Plan, Employer Matching Contribution, Percent of Match				100.00%
Defined Contribution Plan, Contributions by Employee				3.00%
Pension Plan [Member]
Defined Benefit Plan, Benefits Paid				$ 18.5	23.9
Settlement (gain) loss recognized during the period				0.0	4.6	13.4
Pension cost (benefit)				18.2	21.1	30.8
Accumulated other comprehensive income (loss)		(78.9)		(64.4)	(78.9)
Accumulated other comprehensive income (loss), net of tax		(47.2)		(39.5)	(47.2)
Accuarial loss included in accumulated other comprehensive loss				(6.6)
Accumulated benefit obligation		259.6		242.9	259.6	228.1
Employer contribution				25.6	3.6
Fair value of plan assets for postretirement health		150.5		$ 157.2	150.5	162.9
United States Pension Plans of US Entity, Defined Benefit [Member]
Employer contribution						10.0
Common shares included in cash balance plan		$ 3.7			$ 3.7
Foreign Pension Plan, Defined Benefit [Member]
Defined Benefit Plan, Benefit Obligation, percentage		15.40%		16.30%	15.40%
Other Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Benefits Paid				$ 2.0	$ 2.4
Settlement (gain) loss recognized during the period				0.0	0.0	(0.3)
Pension cost (benefit)				1.9	1.8	0.3
Accumulated other comprehensive income (loss)		$ (0.5)		1.1	(0.5)
Accumulated benefit obligation		14.4		13.7	14.4	14.2
Unrecognized actuarial gain		(0.5)		(1.1)	(0.5)
Unrecognized actuarial gain, net of tax		(0.3)		(0.7)	(0.3)
Accumulated benefit obligation		14.4		13.7	14.4
Other Pension Plans, Postretirement or Supplemental Plans, Defined Benefit [Member]
Defined Benefit Plan, Benefits Paid				0.3	0.3
Pension cost (benefit)				(0.8)	(1.6)	(4.3)
Accumulated other comprehensive income (loss)		(2.8)		(2.1)	(2.8)
Accumulated other comprehensive income (loss), net of tax		(2.8)		(2.1)	(2.8)
Accumulated benefit obligation		4.5		4.2	4.5	4.5
Curtailment (benefit) loss recognized during the period				0.0	(0.5)	(0.3)
Employer contribution				(0.6)	(0.5)
Expected employer contributions during the next fiscal year				0.1
Fair value of plan assets for postretirement health		4.2		$ 3.4	4.2	$ 4.9
Assets expected to be returned to the Company during 2016				0
Fixed Income Funds [Member]
Fair value of plan assets for postretirement health		$ 52.6		$ 54.0	$ 52.6
Fixed Income Funds [Member] | United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan, Actual Plan Asset Allocations				35.00%
Defined Benefit Plan, Target Plan Asset Allocations				35.00%
Equity Funds [Member] | United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan, Actual Plan Asset Allocations				65.00%
Defined Benefit Plan, Target Plan Asset Allocations				65.00%
50% [Domain]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match				50.00%
2% [Domain]
Defined Contribution Plan, Contributions by Employee				2.00%