Employee Benefit Plans - Assumptions, Plan Assets and Future Benefit Payments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assumptions used to determine projected benefit obligations
Expected return on plan assets (as a percent)		2.90%	3.00%
Plan Assets:
Total plan assets	$ 106.1	$ 139.6	$ 141.0
Estimated future benefit payments
2016	2.3
2017	2.4
2018	2.7
2019	3.5
2020	3.8
2021-2025	$ 24.4
Minimum
Assumptions used to determine projected benefit obligations
Discount rate (as a percent)	0.30%	0.70%	0.70%
Expected return on plan assets (as a percent)	0.00%
Expected rate of compensation increase (as a percent)	1.00%	1.00%	1.00%
Maximum
Assumptions used to determine projected benefit obligations
Discount rate (as a percent)	2.50%	2.40%	3.80%
Expected return on plan assets (as a percent)	3.00%
Expected rate of compensation increase (as a percent)	3.00%	3.00%	3.00%
Cash and cash equivalents
Plan Assets:
Total plan assets		$ 138.2
Debt securities:
Plan Assets:
Total plan assets	$ 1.2	1.1
Debt securities: Foreign corporations
Plan Assets:
Total plan assets	0.7	0.4
Debt securities: Foreign governments
Plan Assets:
Total plan assets	0.5	0.7
Equity Securities:
Plan Assets:
Total plan assets	0.1	0.1
Equity Securities: Foreign corporations
Plan Assets:
Total plan assets	0.1	0.1
Real estate
Plan Assets:
Total plan assets	0.1	0.1
Swiss Life Collective BVG Foundation
Plan Assets:
Total plan assets	$ 104.7
Guaranteed minimum return on mandatory withdrawal portion of fund (as a percent)	1.75%
Guaranteed minimum return on non-mandatory withdrawal portion of fund (as a percent)	1.25%
The Company's percentage of returns above the guaranteed minimum	90.00%
Percentage of returns above the guaranteed minimum to be retained by Swiss Life	10.00%
Swiss Life Collective BVG Foundation | Bonds including cash
Plan Assets:
Target allocation (as a percent)	75.00%
Swiss Life Collective BVG Foundation | Equity Securities:
Plan Assets:
Target allocation (as a percent)	5.00%
Swiss Life Collective BVG Foundation | Real estate and mortgages
Plan Assets:
Target allocation (as a percent)	20.00%
Other
Plan Assets:
Total plan assets		0.1
Quoted Prices in Active Markets Available (Level 1)
Plan Assets:
Total plan assets	$ 1.4	139.6
Quoted Prices in Active Markets Available (Level 1) | Cash and cash equivalents
Plan Assets:
Total plan assets		138.2
Quoted Prices in Active Markets Available (Level 1) | Debt securities:
Plan Assets:
Total plan assets	1.2	1.1
Quoted Prices in Active Markets Available (Level 1) | Debt securities: Foreign corporations
Plan Assets:
Total plan assets	0.7	0.4
Quoted Prices in Active Markets Available (Level 1) | Debt securities: Foreign governments
Plan Assets:
Total plan assets	0.5	0.7
Quoted Prices in Active Markets Available (Level 1) | Equity Securities:
Plan Assets:
Total plan assets	0.1	0.1
Quoted Prices in Active Markets Available (Level 1) | Equity Securities: Foreign corporations
Plan Assets:
Total plan assets	0.1	0.1
Quoted Prices in Active Markets Available (Level 1) | Real estate
Plan Assets:
Total plan assets	0.1	0.1
Quoted Prices in Active Markets Available (Level 1) | Other
Plan Assets:
Total plan assets		$ 0.1
Significant Other Observable Inputs (Level 2)
Plan Assets:
Total plan assets	104.7
Significant Other Observable Inputs (Level 2) | Swiss Life Collective BVG Foundation
Plan Assets:
Total plan assets	$ 104.7