Employee Benefits Schedule of Changes in Benefit Obligations and Fair Value of Plan Assets (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net actuarial loss recognized in AOCI	[1]	$ (0.5)	$ (13.6)	$ 13.5
Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of period		132.6	118.0
Service cost		2.1	2.6	3.3
Interest cost		4.9	5.3	4.8
Special termination benefits		0.0	1.9	0.0
Loss on curtailment in current period		(7.1)	(8.2)	0.0
Settlements		0.0	(2.3)
Benefit payments		(7.7)	(5.5)
Defined Benefit Plan, Plan Amendments		0.9	0.0
Actuarial loss (gain)		(5.4)	20.8
Benefit obligation, end of period		120.3	132.6	118.0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning of period		81.4	71.7
Actual gain on plan assets		(1.9)	4.5
Company contributions to the plan		7.5	13.0
Benefit payments		(7.7)	(5.5)
Settlements		0.0	(2.3)
Fair value of plan assets, end of period		79.3	81.4	71.7
Underfunded status (current and long-term)		(41.0)	(51.2)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Amounts included in accounts payable and accrued expenses		(2.9)	(4.3)
Amounts included in other long-term liabilities		(38.1)	(46.9)
Total amount recognized in balance sheets		(41.0)	(51.2)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net actuarial loss recognized in AOCI		15.8	21.2
Prior service cost recognized in AOCI		4.1	16.1
Total amount recognized in AOCI		19.9	37.3
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of period		6.6	5.9
Service cost		0.0	0.0	0.1
Interest cost		0.2	0.3	0.3
Special termination benefits		0.0	0.0	0.0
Loss on curtailment in current period		0.0	(0.2)	0.0
Settlements		0.0	0.0
Benefit payments		(0.2)	0.0
Defined Benefit Plan, Plan Amendments		0.0	0.0
Actuarial loss (gain)		(1.4)	0.6
Benefit obligation, end of period		5.2	6.6	5.9
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning of period		0.0	0.0
Actual gain on plan assets		0.0	0.0
Company contributions to the plan		0.2	0.0
Benefit payments		(0.2)	0.0
Settlements		0.0	0.0
Fair value of plan assets, end of period		0.0	0.0	$ 0.0
Underfunded status (current and long-term)		(5.2)	(6.6)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Amounts included in accounts payable and accrued expenses		(0.3)	(0.3)
Amounts included in other long-term liabilities		(4.9)	(6.3)
Total amount recognized in balance sheets		(5.2)	(6.6)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net actuarial loss recognized in AOCI		(0.8)	0.6
Prior service cost recognized in AOCI		1.2	1.4
Total amount recognized in AOCI		$ 0.4	$ 2.0

[1] Presented net of income tax benefit of $0.3 million for the year ended December 31, 2015, net of income tax benefit of $8.5 million for the year ended December 31, 2014, and net of income tax expense of $8.3 million for the year ended December 31, 2013