Income Taxes (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating losses carryforwards [Line Items]
Valuation allowance	$ 6.0	$ 10.5
Dividends Received Deduction Percentage	80.00%
Income taxes additional disclosure
Cumulative amount of unremitted earnings of unconsolidated affiliates	$ 91.9
Deferred taxes provided on unremitted earnings of unconsolidated affiliates	6.5	6.0
Tax on distribution of foreign earnings	1.0	1.9	$ 0.7
Income tax liability, net of credits, on unremitted earnings	2.6	2.7
Accumulated undistributed earnings of foreign subsidiaries	113.6
Federal
Income taxes additional disclosure
Tax on distribution of foreign earnings	1.0	1.9	$ 0.7
Federal | Business combinations
Operating losses carryforwards [Line Items]
Net operating losses carryforwards	10.8
State
Operating losses carryforwards [Line Items]
Valuation allowance	0.3
State | Business combinations
Operating losses carryforwards [Line Items]
Net operating losses carryforwards	49.5
International jurisdictions
Operating losses carryforwards [Line Items]
Valuation allowance	5.7	$ 10.5
Canada | International jurisdictions
Operating losses carryforwards [Line Items]
Net operating losses carryforwards	0.7
U.K. | International jurisdictions
Operating losses carryforwards [Line Items]
Net operating losses carryforwards	$ 9.3