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Capital Stock (Dividends Declared) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Debt Instrument [Line Items]                  
Coupon rate 5.875%           5.875%    
Dividends declared per common share (in usd per share) $ 0.09 [1] $ 0.09 $ 0.09 $ 0.09 $ 0.09 $ 0.07 $ 0.09 $ 0.09 $ 0.34
Total amount $ 19.1 [1] $ 13.3 $ 13.2 $ 13.5 $ 13.3 $ 10.4 $ 19.1 $ 13.3 $ 50.4
Cash dividends payable $ 19.1   $ 13.2       $ 19.1 $ 0.0 $ 13.2
5.875% Senior Notes | Senior Notes                  
Debt Instrument [Line Items]                  
Coupon rate 5.875%           5.875%    
[1] As of March 31, 2018, the Company had $19.1 million of cash dividends payable included in accounts payable and accrued liabilities on the consolidated balance sheet. As of March 31, 2018, the Company was not limited in its capacity to pay dividends under the Senior Credit Facilities Amended Credit Agreement and the indenture governing the 5.875% Senior Notes (see Note 7).